System and method for optimized fuel efficiency and emission output of a diesel powered system

ABSTRACT

A method for minimizing emission output from a diesel powered system having at least one diesel-fueled power generating unit, the method including determining at least one power level required from the diesel powered system in order to accomplish a specified mission, determining an emission output based on the power level required, and using at least one other power level that results in a lower emission output wherein the overall resulting power is proximate the power required.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Continuation-In-Part of U.S. application Ser. No.11/669,364 filed Jan. 31, 2007, which claims priority to U.S.Provisional Application No. 60/849,100 filed Oct. 2, 2006, and U.S.Provisional Application No. 60/850,885 filed Oct. 10, 2006. Thisapplication also claims priority to U.S. Provisional Application No.60/894,039 filed Mar. 9, 2007, and U.S. Provisional Application No.60/939,852.

FIELD OF THE INVENTION

This invention relates to a diesel powered system, such as a train, offhighway vehicle, marine and/or stationary diesel powered system and,more particularly to a system, method, and computer software code foroptimized fuel efficiency and emission output of the diesel poweredsystem.

BACKGROUND OF THE INVENTION

Diesel powered systems such as, but not limited to, off-highwayvehicles, marine diesel powered propulsion plants, stationary dieselpowered system and rail vehicle systems, or trains, usually are poweredby a diesel power unit. With respect to rail vehicle systems, the dieselpower unit is part of at least one locomotive and the train furtherincludes a plurality of rail cars, such as freight cars. Usually morethan one locomotive is provided wherein the locomotives are considered alocomotive consist. Locomotives are complex systems with numeroussubsystems, with each subsystem being interdependent on othersubsystems.

An operator is usually aboard a locomotive to insure the properoperation of the locomotive, and when there is a locomotive consist, theoperator is usually aboard a lead locomotive. A locomotive consist is agroup of locomotives that operate together in operating a train. Inaddition to insuring proper operations of the locomotive, or locomotiveconsist, the operator also is responsible for determining operatingspeeds of the train and forces within the train that the locomotives arepart of. To perform this function, the operator generally must haveextensive experience with operating the locomotive and various trainsover the specified terrain. This knowledge is needed to comply withprescribeable operating speeds that may vary with the train locationalong the track. Moreover, the operator is also responsible for assuringin-train forces remain within acceptable limits.

However, even with knowledge to assure safe operation, the operatorcannot usually operate the locomotive so that the fuel consumption andemissions is minimized for each trip. For example, other factors thatmust be considered may include emission output, operator's environmentalconditions like noise/vibration, a weighted combination of fuelconsumption and emissions output, etc. This is difficult to do since, asan example, the size and loading of trains vary, locomotives and theirfuel/emissions characteristics are different, and weather and trafficconditions vary.

Based on a particular train mission, when building a train, it is commonpractice to provide a range of locomotives in the train make-up to powerthe train, based in part on available locomotives with varied power andrun trip mission history. This typically leads to a large variation oflocomotive power available for an individual train. Additionally, forcritical trains, such as Z-trains, backup power, typically backuplocomotives, is typically provided to cover an event of equipmentfailure, and to ensure the train reaches its destination on time.

Furthermore, when building a train, locomotive emission outputs areusually determined by establishing a weighted average for total emissionoutput based on the locomotives in the train while the train is in idle.These averages are expected to be below a certain emission output whenthe train is in idle. However, typically, there is no furtherdetermination made regarding the actual emission output while the trainis in idle. Thus, though established calculation methods may suggestthat the emission output is acceptable, in actuality the locomotive maybe emitting more emissions than calculated.

When operating a train, train operators typically call for the samenotch settings when operating the train, which in turn may lead to alarge variation in fuel consumption and/or emission output, such as, butnot limited to, No_(x), CO₂, etc., depending on a number of locomotivespowering the train. Thus, the operator usually cannot operate thelocomotives so that the fuel consumption is minimized and emissionoutput is minimized for each trip since the size and loading of trainsvary, and locomotives and their power availability may vary by modeltype.

A train owner usually owns a plurality of trains wherein the trainsoperate over a network of railroad tracks. Because of the integration ofmultiple trains running concurrently within the network of railroadtracks, wherein scheduling issues must also be considered with respectto train operations, train owners would benefit from a way to optimizefuel efficiency and emission output so as to save on overall fuelconsumption while minimizing emission output of multiple trains whilemeeting mission trip time constraints.

Likewise, owners and/or operators of off-highway vehicles, marine dieselpowered propulsion plants, and/or stationary diesel powered systemswould appreciate the financial benefits realized when these dieselpowered system produce optimize fuel efficiency and emission output soas to save on overall fuel consumption while minimizing emission outputof while meeting operating constraints, such as but not limited tomission time constraints.

BRIEF DESCRIPTION OF THE INVENTION

Exemplary embodiments of the invention disclose a system, method andcomputer software code for minimizing emission output from a dieselpowered system having at least one diesel-fueled power generating unit.Towards this end, a method for minimizing emission output from a dieselpowered system having at least one diesel-fueled power generating unitis disclosed. The method has a step for determining at least one powerlevel required from the diesel powered system in order to accomplish aspecified mission. Another step involves determining an emission outputbased on the power level required. Yet another step provides for usingat least one other power level that results in a lower emission outputwherein the overall resulting power is proximate the power required.

In another exemplary embodiment, a computer software code for minimizingemission output from a diesel powered system having a computer and atleast one diesel-fueled power generating unit is disclosed. The computersoftware code includes a computer software module for determining atleast one power level required from the diesel powered system in orderto accomplish a specified mission. A computer software module fordetermining an emission output based on the at least one power levelrequired is further disclosed Another computer software module is forusing at least one other power level that results in a lower emissionoutput wherein the overall resulting power is proximate the powerrequired.

In yet another exemplary embodiment, a system for minimizing emissionoutput from a diesel powered system having at least one diesel-fueledpower generating unit is disclosed. The system has a device configuredto determine an emission output based on a power level required. A powerlevel controller configured to use at least one other power level sothat the resulting power level is nearly equivalent to the power levelrequired while emission output from the at least one other power levelis less than the emission output from the desired power level is furtherdisclosed. Also disclosed is a processor configured to at least one ofdetermine the minimum power level required from the diesel poweredsystem in order to accomplish a specified mission and determine when touse the at least one other power level.

A system for minimizing emission output from a diesel powered systemhaving at least one diesel-fueled power generating unit is disclosed inanother embodiment. The system includes a processor configured todetermine a power level required from the diesel powered system in orderto accomplish a specified mission. A first device configured todetermine an emission output based on the power level required isprovided. Another element provides for is an emission comparison devicethat is configured to compare emission outputs for other power levelswith the emission output based on the power level required. A seconddevice is also included that is configured to use at least one otherpower level so that a resulting power level is proximate the requiredpower level so that an emission level resulting when using the at leastone other power level is less than the power level required.

BRIEF DESCRIPTION OF THE DRAWINGS

A more particular description of the invention briefly described abovewill be rendered by reference to specific embodiments thereof that areillustrated in the appended drawings. Understanding that these drawingsdepict only typical embodiments of the invention and are not thereforeto be considered to be limiting of its scope, exemplary embodiments ofthe invention will be described and explained with additionalspecificity and detail through the use of the accompanying drawings inwhich:

FIG. 1 depicts an exemplary illustration of a flow chart tripoptimization;

FIG. 2 depicts a simplified model of the train that may be employed;

FIG. 3 depicts an exemplary embodiment of elements for tripoptimization;

FIG. 4 depicts an exemplary embodiment of a fuel-use/travel time curve;

FIG. 5 depicts an exemplary embodiment of segmentation decomposition fortrip planning;

FIG. 6 depicts an exemplary embodiment of a segmentation example;

FIG. 7 depicts another exemplary flow chart trip optimization;

FIG. 8 depicts an exemplary illustration of a dynamic display for use byan operator;

FIG. 9 depicts another exemplary illustration of a dynamic display foruse by the operator;

FIG. 10 depicts another exemplary illustration of a dynamic display foruse by the operator;

FIG. 11 depicts an exemplary embodiment of a network of railway trackswith multiple trains;

FIG. 12 depicts an exemplary embodiment of a flowchart illustratingsteps for improving fuel efficiency of a train through optimized trainpower makeup;

FIG. 13 depicts a block diagram of exemplary elements included in asystem for optimized train power makeup;

FIG. 14 depicts a block diagram of a transfer function for determining afuel efficiency and emissions for a diesel powered system;

FIG. 15 depicts an exemplary embodiment of a flow chart illustratingsteps for determining a configuration of a diesel powered system havingat least one diesel-fueled power generating unit;

FIG. 16 depicts an exemplary embodiment of a closed-loop system foroperating a rail vehicle;

FIG. 17 depicts the closed loop system of FIG. 16 integrated with amaster control unit;

FIG. 18 depicts an exemplary embodiment of a closed-loop system foroperating a rail vehicle integrated with another input operationalsubsystem of the rail vehicle;

FIG. 19 depicts another exemplary embodiment of the closed-loop systemwith a converter which may command operation of the master controller;

FIG. 20 depicts an exemplary flowchart of steps for operating a railvehicle in a closed-loop process;

FIG. 21 depicts an embodiment of a speed versus time graph comparingcurrent operations to emissions optimized operation

FIG. 22 depicts a modulation pattern compared to a given notch level;

FIG. 23 depicts an exemplary flowchart of steps for determining aconfiguration of a diesel powered system;

FIG. 24 depicts a system for minimizing emission output; and

FIG. 25 depicts a system for minimizing emission output from a dieselpowered system.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made in detail to the embodiments consistent withthe invention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numerals used throughoutthe drawings refer to the same or like parts.

Though exemplary embodiments of the present invention are described withrespect to rail vehicles, specifically trains and locomotives havingdiesel engines, exemplary embodiments of the invention are alsoapplicable for other uses, such as but not limited to off-highwayvehicles, marine vessels, and stationary units, each which may use adiesel engine. Towards this end, when discussing a specified mission,this includes a task or requirement to be performed by the dieselpowered system. Therefore, with respect to railway, marine oroff-highway vehicle applications this may refer to the movement of thesystem from a present location to a destination. In the case ofstationary applications, such as but not limited to a stationary powergenerating station or network of power generating stations, a specifiedmission may refer to an amount of wattage (e.g., MW/hr) or otherparameter or requirement to be satisfied by the diesel powered system.Likewise, operating condition of the diesel-fueled power generating unitmay include one or more of speed, load, fueling value, timing, etc.

In one exemplary example involving marine vessels, a plurality of tugsmay be operating together where all are moving the same larger vessel,where each tug is linked in time to accomplish the mission of moving thelarger vessel. In another exemplary example a single marine vessel mayhave a plurality of engines. Off Highway Vehicle (OHV) may involve afleet of vehicles that have a same mission to move earth, from locationA to location B, where each OHV is linked in time to accomplish themission. With respect to a stationary power generating station, aplurality of stations may be grouped together collectively generatingpower for a specific location and/or purpose. In another exemplaryembodiment, a single station is provided, but with a plurality ofgenerators making up the single station.

Exemplary embodiments of the invention solves the problems in the art byproviding a system, method, and computer implemented method, such as acomputer software code, for improving overall fuel efficiency andemissions through optimized power makeup. With respect to locomotives,exemplary embodiments of the present invention are also operable whenthe locomotive consist is in distributed power operations.

Persons skilled in the art will recognize that an apparatus, such as adata processing system, including a CPU, memory, I/O, program storage, aconnecting bus, and other appropriate components, could be programmed orotherwise designed to facilitate the practice of the method of theinvention. Such a system would include appropriate program means forexecuting the method of the invention.

Also, an article of manufacture, such as a pre-recorded disk or othersimilar computer program product, for use with a data processing system,could include a storage medium and program means recorded thereon fordirecting the data processing system to facilitate the practice of themethod of the invention. Such apparatus and articles of manufacture alsofall within the spirit and scope of the invention.

Broadly speaking, the technical effect is an improvement of fuelefficiency and emission output through optimized power makeup. Tofacilitate an understanding of the exemplary embodiments of theinvention, it is described hereinafter with reference to specificimplementations thereof. Exemplary embodiments of the invention may bedescribed in the general context of computer-executable instructions,such as program modules, being executed by a computer. Generally,program modules include routines, programs, objects, components, datastructures, etc. that perform particular tasks or implement particularabstract data types. For example, the software programs that underlieexemplary embodiments of the invention can be coded in differentlanguages, for use with different platforms. In the description thatfollows, examples of the invention may be described in the context of aweb portal that employs a web browser. It will be appreciated, however,that the principles that underlie exemplary embodiments of the inventioncan be implemented with other types of computer software technologies aswell.

Moreover, those skilled in the art will appreciate that exemplaryembodiments of the invention may be practiced with other computer systemconfigurations, including hand-held devices, multiprocessor systems,microprocessor-based or programmable consumer electronics,minicomputers, mainframe computers, and the like. Exemplary embodimentsof the invention may also be practiced in distributed computingenvironments where tasks are performed by remote processing devices thatare linked through a communications network. In a distributed computingenvironment, program modules may be located in both local and remotecomputer storage media including memory storage devices. These local andremote computing environments may be contained entirely within thelocomotive, or adjacent locomotives in consist, or off-board in waysideor central offices where wireless communication is used.

Throughout this document the term locomotive consist is used. As usedherein, a locomotive consist may be described as having one or morelocomotives in succession, connected together so as to provide motoringand/or braking capability. The locomotives are connected together whereno train cars are in between the locomotives. The train can have morethan one locomotive consists in its composition. Specifically, there canbe a lead consist and more than one remote consists, such as midway inthe line of cars and another remote consist at the end of the train.Each locomotive consist may have a first locomotive and traillocomotive(s). Though a first locomotive is usually viewed as the leadlocomotive, those skilled in the art will readily recognize that thefirst locomotive in a multi locomotive consist may be physically locatedin a physically trailing position. Though a locomotive consist isusually viewed as successive locomotives, those skilled in the art willreadily recognize that a consist group of locomotives may also berecognized as a consist even when at least a car separates thelocomotives, such as when the locomotive consist is configured fordistributed power operation, wherein throttle and braking commands arerelayed from the lead locomotive to the remote trains by a radio link orphysical cable. Towards this end, the term locomotive consist should benot be considered a limiting factor when discussing multiple locomotiveswithin the same train.

Referring now to the drawings, embodiments of the present invention willbe described. Exemplary embodiments of the invention can be implementedin numerous ways, including as a system (including a computer processingsystem), a method (including a computerized method), an apparatus, acomputer readable medium, a computer program product, a graphical userinterface, including a web portal, or a data structure tangibly fixed ina computer readable memory. Several embodiments of the invention arediscussed below.

FIG. 1 depicts an exemplary illustration of a flow chart of an exemplaryembodiment of the present invention. As illustrated, instructions areinput specific to planning a trip either on board or from a remotelocation, such as a dispatch center 10. Such input information includes,but is not limited to, train position, consist description (such aslocomotive models), locomotive power description, performance oflocomotive traction transmission, consumption of engine fuel as afunction of output power, cooling characteristics, the intended triproute (effective track grade and curvature as function of milepost or an“effective grade” component to reflect curvature following standardrailroad practices), the train represented by car makeup and loadingtogether with effective drag coefficients, trip desired parametersincluding, but not limited to, start time and location, end location,desired travel time, crew (user and/or operator) identification, crewshift expiration time, and route.

This data may be provided to the locomotive 42 in a number of ways, suchas, but not limited to, an operator manually entering this data into thelocomotive 42 via an onboard display, inserting a memory device such asa hard card and/or USB drive containing the data into a receptacleaboard the locomotive, and transmitting the information via wirelesscommunication from a central or wayside location 41, such as a tracksignaling device and/or a wayside device, to the locomotive 42.Locomotive 42 and train 31 load characteristics (e.g., drag) may alsochange over the route (e.g., with altitude, ambient temperature andcondition of the rails and rail-cars), and the plan may be updated toreflect such changes as needed by any of the methods discussed aboveand/or by real-time autonomous collection of locomotive/trainconditions. This includes for example, changes in locomotive or traincharacteristics detected by monitoring equipment on or off board thelocomotive(s) 42.

The track signal system determines the allowable speed of the train.There are many types of track signal systems and the operating rulesassociated with each of the signals. For example, some signals have asingle light (on/off), some signals have a single lens with multiplecolors, and some signals have multiple lights and colors. These signalscan indicate the track is clear and the train may proceed at maxallowable speed. They can also indicate a reduced speed or stop isrequired. This reduced speed may need to be achieved immediately, or ata certain location (e.g. prior to the next signal or crossing).

The signal status is communicated to the train and/or operator throughvarious means. Some systems have circuits in the track and inductivepick-up coils on the locomotives. Other systems have wirelesscommunications systems. Signal systems can also require the operator tovisually inspect the signal and take the appropriate actions.

The signaling system may interface with the on-board signal system andadjust the locomotive speed according to the inputs and the appropriateoperating rules. For signal systems that require the operator tovisually inspect the signal status, the operator screen will present theappropriate signal options for the operator to enter based on thetrain's location. The type of signal systems and operating rules, as afunction of location, may be stored in an onboard database 63.

Based on the specification data input into the exemplary embodiment ofthe present invention, an optimal plan which minimizes fuel use and/oremissions produced subject to speed limit constraints along the routewith desired start and end times is computed to produce a trip profile12. The profile contains the optimal speed and power (notch) settingsthe train is to follow, expressed as a function of distance and/or time,and such train operating limits, including but not limited to, themaximum notch power and brake settings, and speed limits as a functionof location, and the expected fuel used and emissions generated. In anexemplary embodiment, the value for the notch setting is selected toobtain throttle change decisions about once every 10 to 30 seconds.Those skilled in the art will readily recognize that the throttle changedecisions may occur at a longer or shorter duration, if needed and/ordesired to follow an optimal speed profile. In a broader sense, itshould be evident to ones skilled in the art the profiles provide powersettings for the train, either at the train level, consist level and/orindividual train level. Power comprises braking power, motoring power,and airbrake power. In another preferred embodiment, instead ofoperating at the traditional discrete notch power settings, theexemplary embodiment of the present invention is able to select acontinuous power setting determined as optimal for the profile selected.Thus, for example, if an optimal profile specifies a notch setting of6.8, instead of operating at notch setting 7, the locomotive 42 canoperate at 6.8. Allowing such intermediate power settings may bringadditional efficiency benefits as described below.

The procedure used to compute the optimal profile can be any number ofmethods for computing a power sequence that drives the train 31 tominimize fuel and/or emissions subject to locomotive operating andschedule constraints, as summarized below. In some cases the requiredoptimal profile may be close enough to one previously determined, owingto the similarity of the train configuration, route and environmentalconditions. In these cases it may be sufficient to look up the drivingtrajectory within a database 63 and attempt to follow it. When nopreviously computed plan is suitable, methods to compute a new oneinclude, but are not limited to, direct calculation of the optimalprofile using differential equation models which approximate the trainphysics of motion. The setup involves selection of a quantitativeobjective function, commonly a weighted sum (integral) of modelvariables that correspond to rate of fuel consumption and emissionsgeneration plus a term to penalize excessive throttle variation.

An optimal control formulation is set up to minimize the quantitativeobjective function subject to constraints including but not limited to,speed limits and minimum and maximum power (throttle) settings andmaximum cumulative and instantaneous emissions. Depending on planningobjectives at any time, the problem may be setup flexibly to minimizefuel subject to constraints on emissions and speed limits, or tominimize emissions, subject to constraints on fuel use and arrival time.It is also possible to setup, for example, a goal to minimize the totaltravel time without constraints on total emissions or fuel use wheresuch relaxation of constraints would be permitted or required for themission.

Throughout the document exemplary equations and objective functions arepresented for minimizing locomotive fuel consumption. These equationsand functions are for illustration only as other equations and objectivefunctions can be employed to optimize fuel consumption or to optimizeother locomotive/train operating parameters.

Mathematically, the problem to be solved may be stated more precisely.The basic physics are expressed by:

${\frac{x}{t} = v};{{x(0)} = 0.0};{{x\left( T_{f} \right)} = D}$${\frac{v}{t} = {{T_{e}\left( {u,v} \right)} - {G_{a}(x)} - {R(v)}}};{{v(0)} - 0.0};{{v\left( T_{f} \right)} = 0.0}$

Where x is the position of the train, v its velocity and t is time (inmiles, miles per hour and minutes or hours as appropriate) and u is thenotch (throttle) command input. Further, D denotes the distance to betraveled, T_(f) the desired arrival time at distance D along the track,T_(e) is the tractive effort produced by the locomotive consist, G_(a)is the gravitational drag which depends on the train length, trainmakeup and terrain on which the train is located, R is the net speeddependent drag of the locomotive consist and train combination. Theinitial and final speeds can also be specified, but without loss ofgenerality are taken to be zero here (train stopped at beginning andend). Finally, the model is readily modified to include other importantdynamics such the lag between a change in throttle, u, and the resultingtractive effort or braking. Using this model, an optimal controlformulation is set up to minimize the quantitative objective functionsubject to constraints including but not limited to, speed limits andminimum and maximum power (throttle) settings. Depending on planningobjectives at any time, the problem may be setup flexibly to minimizefuel subject to constraints on emissions and speed limits, or tominimize emissions, subject to constraints on fuel use and arrival time.

It is also possible to setup, for example, a goal to minimize the totaltravel time without constraints on total emissions or fuel use wheresuch relaxation of constraints would be permitted or required for themission. All these performance measures can be expressed as a linearcombination of any of the following:

${\min\limits_{u{(t)}}{\int_{0}^{T_{f}}{{F\left( {u(t)} \right)}{t}}}} - {{Minimize}\mspace{14mu} {total}\mspace{14mu} {fuel}\mspace{14mu} {consumption}}$${\min\limits_{u{(t)}}T_{f}} - {{Minimize}\mspace{14mu} {Travel}\mspace{14mu} {Time}}$${\min\limits_{u_{i}}{\sum\limits_{i = 2}^{n_{d}}\; \left( {u_{i} - u_{i - 1}} \right)^{2}}} - \begin{matrix}{{{Minimize}\mspace{14mu} {notch}\mspace{20mu} {jockeying}}\mspace{11mu}} \\\left( {{piecewise}\mspace{14mu} {constant}\mspace{14mu} {input}} \right)\end{matrix}$${\min\limits_{u{(t)}}{\int_{0}^{T_{f}}{\left( {{u}/{t}} \right)^{2}{t}}}} - \begin{matrix}{{Minimize}\mspace{14mu} {notch}\mspace{14mu} {jockeying}} \\\left( {{continuous}\mspace{14mu} {input}} \right)\end{matrix}$

Replace the fuel term F in (1) with a term corresponding to emissionsproduction. For example for emissions

${\min\limits_{u{(t)}}{\int_{0}^{T_{f}}{{E\left( {u(t)} \right)}{t}}}} - {{Minimize}\mspace{14mu} {total}\mspace{14mu} {emissions}\mspace{14mu} {{consumption}.}}$

In this equation E is the quantity of emissions in gm/hphr for each ofthe notches (or power settings). In addition a minimization could bedone based on a weighted total of fuel and emissions.

A commonly used and representative objective function is thus

$\begin{matrix}{{\min\limits_{u{(t)}}{\alpha_{1}{\int_{0}^{T_{f}}{{F\left( {u(t)} \right)}{t}}}}} + {\alpha_{3}T_{f}} + {\alpha_{2}{\int_{0}^{T_{f}}{\left( {{u}/{t}} \right)^{2}{t}}}}} & ({OP})\end{matrix}$

The coefficients of the linear combination depend on the importance(weight) given to each of the terms. Note that in equation (OP), u(t) isthe optimizing variable that is the continuous notch position. Ifdiscrete notch is required, e.g. for older locomotives, the solution toequation (OP) is discretized, which may result in lower fuel savings.Finding a minimum time solution (α₁ set to zero and α₂ set to zero or arelatively small value) is used to find a lower bound for the achievabletravel time (T_(f)=T_(fmin)). In this case, both u(t) and T_(f) areoptimizing variables. The preferred embodiment solves the equation (OP)for various values of T_(f) with T_(f)>T_(fmin) with α₃ set to zero. Inthis latter case, T_(f) is treated as a constraint.

For those familiar with solutions to such optimal problems, it may benecessary to adjoin constraints, e.g. the speed limits along the path:

0≦v≦SL(x)  i.

Or when using minimum time as the objective, that an end pointconstraint must hold, e.g. total fuel consumed must be less than what isin the tank, e.g. via:

i.  0 < ∫₀^(T_(f))F(u(t))t ≤ W_(F)

Where W_(F) is the fuel remaining in the tank at T_(f). Those skilled inthe art will readily recognize that equation (OP) can be in other formsas well and that what is presented above is an exemplary equation foruse in the exemplary embodiment of the present invention.

Reference to emissions in the context of the exemplary embodiment of thepresent invention is actually directed towards cumulative emissionsproduced in the form of oxides of nitrogen (NOx), carbon oxides(CO_(x)), unburned hydrocarbons (HC), and particulate matter (PM), etc.However, other emissions may include, but not be limited to a maximumvalue of electromagnetic emission, such as a limit on radio frequency(RF) power output, measured in watts, for respective frequencies emittedby the locomotive. Yet another form of emission is the noise produced bythe locomotive, typically measured in decibels (dB). An emissionrequirement may be variable based on a time of day, a time of year,and/or atmospheric conditions such as weather or pollutant level in theatmosphere. Emission regulations may vary geographically across arailroad system. For example, an operating area such as a city or statemay have specified emission objectives, and an adjacent area may havedifferent emission objectives, for example a lower amount of allowedemissions or a higher fee charged for a given level of emissions.

Accordingly, an emission profile for a certain geographic area may betailored to include maximum emission values for each of the regulatedemissions including in the profile to meet a predetermined emissionobjective required for that area. Typically, for a locomotive, theseemission parameters are determined by, but not limited to, the power(Notch) setting, ambient conditions, engine control method, etc. Bydesign, every locomotive must be compliant with EPA emission standards,and thus in an embodiment of the present invention that optimizesemissions this may refer to mission-total emissions, for which there isno current EPA specification. Operation of the locomotive according tothe optimized trip plan is at all times compliant with EPA emissionstandards. Those skilled in the art will readily recognize that becausediesel engines are used in other applications, other regulations mayalso be applicable. For example, CO₂ emissions are considered ininternational treaties.

If a key objective during a trip mission is to reduce emissions, theoptimal control formulation, equation (OP), would be amended to considerthis trip objective. A key flexibility in the optimization setup is thatany or all of the trip objectives can vary by geographic region ormission. For example, for a high priority train, minimum time may be theonly objective on one route because it is high priority traffic. Inanother example emission output could vary from state to state along theplanned train route.

To solve the resulting optimization problem, in an exemplary embodimentthe present invention transcribes a dynamic optimal control problem inthe time domain to an equivalent static mathematical programming problemwith N decision variables, where the number ‘N’ depends on the frequencyat invention distributes travel time amongst all the segments of thetrip in an optimal way so that the total trip time required is satisfiedand total fuel consumed over all the segments is as small as possible.An exemplary 3 segment trip is disclosed in FIG. 6 and discussed below.Those skilled in the art will recognize however, through segments arediscussed, the trip plan may comprise a single segment representing thecomplete trip.

FIG. 4 depicts an exemplary embodiment of a fuel-use/travel time curve.As mentioned previously, such a curve 50 is created when calculating anoptimal trip profile for various travel times for each segment. That is,for a given travel time 49, fuel used 53 is the result of a detaileddriving profile computed as described above. Once travel times for eachsegment are allocated, a power/speed plan is determined for each segmentfrom the previously computed solutions. If there are any waypointconstraints on speed between the segments, such as, but not limited to,a change in a speed limit, they are matched up during creation of theoptimal trip profile. If speed restrictions change in only a singlesegment, the fuel use/travel-time curve 50 has to be re-computed foronly the segment changed. This reduces time for having to re-calculatemore parts, or segments, of the trip. If the locomotive consist or trainchanges significantly along the route, e.g. from loss of a locomotive orpickup or set-out of cars, then driving profiles for all subsequentsegments must be recomputed creating new instances of the curve 50.These new curves 50 would then be used along with new scheduleobjectives to plan the remaining trip.

Once a trip plan is created as discussed above, a trajectory of speedand power versus distance is used to reach a destination with minimumfuel and/or emissions at the required trip time. There are several waysin which to execute the trip plan. As provided below in more detail, inan exemplary embodiment, when in a coaching mode information isdisplayed to the operator for the operator to follow to achieve therequired power and speed determined according to the optimal trip plan.In this mode, the operating information is suggested operatingconditions that the operator should use. In another exemplaryembodiment, acceleration and maintaining a constant speed are whichthrottle and braking adjustments are made and the duration of the trip.For typical problems, this N can be in the thousands. For example in anexemplary embodiment, suppose a train is traveling a 172-mile stretch oftrack in the southwest United States. Utilizing the exemplary embodimentof the present invention, an exemplary 7.6% saving in fuel used may berealized when comparing a trip determined and followed using theexemplary embodiment of the present invention versus an actual driverthrottle/speed history where the trip was determined by an operator. Theimproved savings is realized because the optimization realized by usingthe exemplary embodiment of the present invention produces a drivingstrategy with both less drag loss and little or no braking loss comparedto the trip plan of the operator.

To make the optimization described above computationally tractable, asimplified model of the train may be employed, such as illustrated inFIG. 2 and the equations discussed above. A key refinement to theoptimal profile is produced by driving a more detailed model with theoptimal power sequence generated, to test if other thermal, electricaland mechanical constraints are violated, leading to a modified profilewith speed versus distance that is closest to a run that can be achievedwithout harming locomotive or train equipment, i.e. satisfyingadditional implied constraints such thermal and electrical limits on thelocomotive and inter-car forces in the train.

Referring back to FIG. 1, once the trip is started 12, power commandsare generated 14 to put the plan in motion. Depending on the operationalset-up of the exemplary embodiment of the present invention, one commandis for the locomotive to follow the optimized power command 16 so as toachieve the optimal speed. The exemplary embodiment of the presentinvention obtains actual speed and power information from the locomotiveconsist of the train 18. Owing to the inevitable approximations in themodels used for the optimization, a closed-loop calculation ofcorrections to optimized power is obtained to track the desired optimalspeed. Such corrections of train operating limits can be madeautomatically or by the operator, who always has ultimate control of thetrain.

In some cases, the model used in the optimization may differsignificantly from the actual train. This can occur for many reasons,including but not limited to, extra cargo pickups or setouts,locomotives that fail in route, and errors in the initial database 63 ordata entry by the operator. For these reasons a monitoring system is inplace that uses real-time train data to estimate locomotive and/or trainparameters in real time 20. The estimated parameters are then comparedto the assumed parameters used when the trip was initially created 22.Based on any differences in the assumed and estimated values, the tripmay be re-planned 24, should large enough savings accrue from a newplan.

Other reasons a trip may be re-planned include directives from a remotelocation, such as dispatch and/or the operator requesting a change inobjectives to be consistent with more global movement planningobjectives. More global movement planning objectives may include, butare not limited to, other train schedules, allowing exhaust to dissipatefrom a tunnel, maintenance operations, etc. Another reason may be due toan onboard failure of a component. Strategies for re-planning may begrouped into incremental and major adjustments depending on the severityof the disruption, as discussed in more detail below. In general, a“new” plan must be derived from a solution to the optimization problemequation (OP) described above, but frequently faster approximatesolutions can be found, as described herein.

In operation, the locomotive 42 will continuously monitor systemefficiency and continuously update the trip plan based on the actualefficiency measured, whenever such an update would improve tripperformance. Re-planning computations may be carried out entirely withinthe locomotive(s) or fully or partially moved to a remote location, suchas dispatch or wayside processing facilities where wireless technologyis used to communicate the plans to the locomotive 42. The exemplaryembodiment of the present invention may also generate efficiency trendsthat can be used to develop locomotive fleet data regarding efficiencytransfer functions. The fleet-wide data may be used when determining theinitial trip plan, and may be used for network-wide optimizationtradeoff when considering locations of a plurality of trains. Forexample, the travel-time fuel use tradeoff curve as illustrated in FIG.4 reflects a capability of a train on a particular route at a currenttime, updated from ensemble averages collected for many similar trainson the same route. Thus, a central dispatch facility collecting curveslike FIG. 4 from many locomotives could use that information to bettercoordinate overall train movements to achieve a system-wide advantage infuel use or throughput. Those skilled in the art will recognize thatvarious fuel types, such as but not limited to diesel fuel, heavy marinefuels, palm oil, bio-diesel, etc., may be used.

Many events in daily operations can lead to a need to generate or modifya currently executing plan, where it desired to keep the same tripobjectives, for when a train is not on schedule for planned meet or passwith another train and it needs to make up time. Using the actual speed,power and location of the locomotive, a comparison is made between aplanned arrival time and the currently estimated (predicted) arrivaltime 25. Based on a difference in the times, as well as the differencein parameters (detected or changed by dispatch or the operator), theplan is adjusted 26. This adjustment may be made automatically followinga railroad company's desire for how such departures from plan should behandled or manually propose alternatives for the on-board operator anddispatcher to jointly decide the best way to get back on plan. Whenevera plan is updated but where the original objectives, such as but notlimited to arrival time remain the same, additional changes may befactored in concurrently, e.g. new future speed limit changes, whichcould affect the feasibility of ever recovering the original plan. Insuch instances if the original trip plan cannot be maintained, or inother words the train is unable to meet the original trip planobjectives, as discussed herein other trip plan(s) may be presented tothe operator and/or remote facility, or dispatch.

A re-plan may also be made when it is desired to change the originalobjectives. Such re-planning can be done at either fixed preplannedtimes, manually at the discretion of the operator or dispatcher, orautonomously when predefined limits, such a train operating limits, areexceeded. For example, if the current plan execution is running late bymore than a specified threshold, such as thirty minutes, the exemplaryembodiment of the present invention can re-plan the trip to accommodatethe delay at expense of increased fuel as described above or to alertthe operator and dispatcher how much of the time can be made up at all(i.e. what minimum time to go or the maximum fuel that can be savedwithin a time constraint). Other triggers for re-plan can also beenvisioned based on fuel consumed or the health of the power consist,including but not limited time of arrival, loss of horsepower due toequipment failure and/or equipment temporary malfunction (such asoperating too hot or too cold), and/or detection of gross setup errors,such in the assumed train load. That is, if the change reflectsimpairment in the locomotive performance for the current trip, these maybe factored into the models and/or equations used in the optimization.

Changes in plan objectives can also arise from a need to coordinateevents where the plan for one train compromises the ability of anothertrain to meet objectives and arbitration at a different level, e.g. thedispatch office is required. For example, the coordination of meets andpasses may be further optimized through train-to-train communications.Thus, as an example, if a train knows that it is behind in reaching alocation for a meet and/or pass, communications from the other train cannotify the late train (and/or dispatch). The operator can then enterinformation pertaining to being late into the exemplary embodiment ofthe present invention wherein the exemplary embodiment will recalculatethe train's trip plan. The exemplary embodiment of the present inventioncan also be used at a high level, or network-level, to allow a dispatchto determine which train should slow down or speed up should a scheduledmeet and/or pass time constraint may not be met. As discussed herein,this is accomplished by trains transmitting data to the dispatch toprioritize how each train should change its planning objective. A choicecould depend either from schedule or fuel saving benefits, depending onthe situation.

For any of the manually or automatically initiated re-plans, exemplaryembodiments of the present invention may present more than one trip planto the operator. In an exemplary embodiment the present invention willpresent different profiles to the operator, allowing the operator toselect the arrival time and understand the corresponding fuel and/oremission impact. Such information can also be provided to the dispatchfor similar consideration, either as a simple list of alternatives or asa plurality of tradeoff curves such as illustrated in FIG. 4.

The exemplary embodiment of the present invention has the ability oflearning and adapting to key changes in the train and power consistwhich can be incorporated either in the current plan and/or for futureplans. For example, one of the triggers discussed above is loss ofhorsepower. When building up horsepower over time, either after a lossof horsepower or when beginning a trip, transition logic is utilized todetermine when desired horsepower is achieved. This information can besaved in the locomotive database 61 for use in optimizing either futuretrips or the current trip should loss of horsepower occur again.

FIG. 3 depicts an exemplary embodiment of elements of that may part ofan exemplary system. A locator element 30 to determine a location of thetrain 31 is provided. The locator element 30 can be a GPS sensor, or asystem of sensors, that determine a location of the train 31. Examplesof such other systems may include, but are not limited to, waysidedevices, such as radio frequency automatic equipment identification (RFAEI) Tags, dispatch, and/or video determination. Another system mayinclude the tachometer(s) aboard a locomotive and distance calculationsfrom a reference point. As discussed previously, a wirelesscommunication system 47 may also be provided to allow for communicationsbetween trains and/or with a remote location, such as dispatch.Information about travel locations may also be transferred from othertrains.

A track characterization element 33 to provide information about atrack, principally grade and elevation and curvature information, isalso provided. The track characterization element 33 may include anon-board track integrity database 36. Sensors 38 are used to measure atractive effort 40 being hauled by the locomotive consist 42, throttlesetting of the locomotive consist 42, locomotive consist 42configuration information, speed of the locomotive consist 42,individual locomotive configuration, individual locomotive capability,etc. In an exemplary embodiment the locomotive consist 42 configurationinformation may be loaded without the use of a sensor 38, but is inputby other approaches as discussed above. Furthermore, the health of thelocomotives in the consist may also be considered. For example, if onelocomotive in the consist is unable to operate above power notch level5, this information is used when optimizing the trip plan.

Information from the locator element may also be used to determine anappropriate arrival time of the train 31. For example, if there is atrain 31 moving along a track 34 towards a destination and no train isfollowing behind it, and the train has no fixed arrival deadline toadhere to, the locator element, including but not limited to radiofrequency automatic equipment identification (RF AEI) Tags, dispatch,and/or video determination, may be used to gage the exact location ofthe train 31. Furthermore, inputs from these signaling systems may beused to adjust the train speed. Using the on-board track database,discussed below, and the locator element, such as GPS, the exemplaryembodiment of the present invention can adjust the operator interface toreflect the signaling system state at the given locomotive location. Ina situation where signal states would indicate restrictive speeds ahead,the planner may elect to slow the train to conserve fuel consumption.

Information from the locator element 30 may also be used to changeplanning objectives as a function of distance to destination. Forexample, owing to inevitable uncertainties about congestion along theroute, “faster” time objectives on the early part of a route may beemployed as hedge against delays that statistically occur later. If ithappens on a particular trip that delays do not occur, the objectives ona latter part of the journey can be modified to exploit the built-inslack time that was banked earlier, and thereby recover some fuelefficiency. A similar strategy could be invoked with respect toemissions restrictive objectives, e.g. approaching an urban area.

As an example of the hedging strategy, if a trip is planned from NewYork to Chicago, the system may have an option to operate the trainslower at either the beginning of the trip or at the middle of the tripor at the end of the trip. The exemplary embodiment of the presentinvention would optimize the trip plan to allow for slower operation atthe end of the trip since unknown constraints, such as but not limitedto weather conditions, track maintenance, etc., may develop and becomeknown during the trip. As another consideration, if traditionallycongested areas are known, the plan is developed with an option to havemore flexibility around these traditionally congested regions.Therefore, the exemplary embodiment of the present invention may alsoconsider weighting/penalty as a function of time/distance into thefuture and/or based on known/past experience. Those skilled in the artwill readily recognize that such planning and re-planning to take intoconsideration weather conditions, track conditions, other trains on thetrack, etc., may be taking into consideration at any time during thetrip wherein the trip plan is adjust accordingly.

FIG. 3 further discloses other elements that may be part of theexemplary embodiment of the present invention. A processor 44 isprovided that is operable to receive information from the locatorelement 30, track characterizing element 33, and sensors 38. Analgorithm 46 operates within the processor 44. The algorithm 46 is usedto compute an optimized trip plan based on parameters involving thelocomotive 42, train 31, track 34, and objectives of the mission asdescribed above. In an exemplary embodiment, the trip plan isestablished based on models for train behavior as the train 31 movesalong the track 34 as a solution of non-linear differential equationsderived from physics with simplifying assumptions that are provided inthe algorithm. The algorithm 46 has access to the information from thelocator element 30, track characterizing element 33 and/or sensors 38 tocreate a trip plan minimizing fuel consumption of a locomotive consist42, minimizing emissions of a locomotive consist 42, establishing adesired trip time, and/or ensuring proper crew operating time aboard thelocomotive consist 42. In an exemplary embodiment, a driver, orcontroller element, 51 is also provided. As discussed herein thecontroller element 51 is used for controlling the train as it followsthe trip plan. In an exemplary embodiment discussed further herein, thecontroller element 51 makes train operating decisions autonomously. Inanother exemplary embodiment the operator may be involved with directingthe train to follow the trip plan.

A requirement of the exemplary embodiment of the present invention isthe ability to initially create and quickly modify on the fly any planthat is being executed. This includes creating the initial plan when along distance is involved, owing to the complexity of the planoptimization algorithm. When a total length of a trip profile exceeds agiven distance, an algorithm 46 may be used to segment the missionwherein the mission may be divided by waypoints. Though only a singlealgorithm 46 is discussed, those skilled in the art will readilyrecognize that more than one algorithm may be used where the algorithmsmay be connected together. The waypoint may include natural locationswhere the train 31 stops, such as, but not limited to, sidings where ameet with opposing traffic, or pass with a train behind the currenttrain is scheduled to occur on single-track rail, or at yard sidings orindustry where cars are to be picked up and set out, and locations ofplanned work. At such waypoints, the train 31 may be required to be atthe location at a scheduled time and be stopped or moving with speed ina specified range. The time duration from arrival to departure atwaypoints is called dwell time.

In an exemplary embodiment, the present invention is able to break downa longer trip into smaller segments in a special systematic way. Eachsegment can be somewhat arbitrary in length, but is typically picked ata natural location such as a stop or significant speed restriction, orat key mileposts that define junctions with other routes. Given apartition, or segment, selected in this way, a driving profile iscreated for each segment of track as a function of travel time taken asan independent variable, such as shown in FIG. 4. The fuelused/travel-time tradeoff associated with each segment can be computedprior to the train 31 reaching that segment of track. A total trip plancan be created from the driving profiles created for each segment. Theexemplary embodiment of the performed. However, when the train 31 mustbe slowed, the operator is responsible for applying a braking system 52.In another exemplary embodiment of the present invention commands forpowering and braking are provided as required to follow the desiredspeed-distance path.

Feedback control strategies are used to provide corrections to the powercontrol sequence in the profile to correct for such events as, but notlimited to, train load variations caused by fluctuating head windsand/or tail winds. Another such error may be caused by an error in trainparameters, such as, but not limited to, train mass and/or drag, whencompared to assumptions in the optimized trip plan. A third type oferror may occur with information contained in the track database 36.Another possible error may involve un-modeled performance differencesdue to the locomotive engine, traction motor thermal deration and/orother factors. Feedback control strategies compare the actual speed as afunction of position to the speed in the desired optimal profile. Basedon this difference, a correction to the optimal power profile is addedto drive the actual velocity toward the optimal profile. To assurestable regulation, a compensation algorithm may be provided whichfilters the feedback speeds into power corrections to assureclosed-performance stability is assured. Compensation may includestandard dynamic compensation as used by those skilled in the art ofcontrol system design to meet performance objectives.

Exemplary embodiments of the present invention allow the simplest andtherefore fastest means to accommodate changes in trip objectives, whichis the rule, rather than the exception in railroad operations. In anexemplary embodiment to determine the fuel-optimal trip from point A topoint B where there are stops along the way, and for updating the tripfor the remainder of the trip once the trip has begun, a sub-optimaldecomposition method is usable for finding an optimal trip profile.Using modeling methods the computation method can find the trip planwith specified travel time and initial and final speeds, so as tosatisfy all the speed limits and locomotive capability constraints whenthere are stops. Though the following discussion is directed towardsoptimizing fuel use, it can also be applied to optimize other factors,such as, but not limited to, emissions, schedule, crew comfort, and loadimpact. The method may be used at the outset in developing a trip plan,and more importantly to adapting to changes in objectives afterinitiating a trip.

As discussed herein, exemplary embodiments of the present invention mayemploy a setup as illustrated in the exemplary flow chart depicted inFIG. 5, and as an exemplary 3 segment example depicted in detail in FIG.6. As illustrated, the trip may be broken into two or more segments, T1,T2, and T3. Though as discussed herein, it is possible to consider thetrip as a single segment. As discussed herein, the segment boundariesmay not result in equal segments. Instead the segments use natural ormission specific boundaries. Optimal trip plans are pre-computed foreach segment. If fuel use versus trip time is the trip object to be met,fuel versus trip time curves are built for each segment. As discussedherein, the curves may be based on other factors, wherein the factorsare objectives to be met with a trip plan. When trip time is theparameter being determined, trip time for each segment is computed whilesatisfying the overall trip time constraints. FIG. 6 illustrates speedlimits for an exemplary 3 segment 200 mile trip 97. Further illustratedare grade changes over the 200 mile trip 98. A combined chart 99illustrating curves for each segment of the trip of fuel used over thetravel time is also shown.

Using the optimal control setup described previously, the presentcomputation method can find the trip plan with specified travel time andinitial and final speeds, so as to satisfy all the speed limits andlocomotive capability constraints when there are stops. Though thefollowing detailed discussion is directed towards optimizing fuel use,it can also be applied to optimize other factors as discussed herein,such as, but not limited to, emissions. A key flexibility is toaccommodate desired dwell time at stops and to consider constraints onearliest arrival and departure at a location as may be required, forexample, in single-track operations where the time to be in or get by asiding is critical.

Exemplary embodiments of the present invention find a fuel-optimal tripfrom distance D₀ to D_(M), traveled in time T, with M−1 intermediatestops at D₁, . . . , D_(M-1), and with the arrival and departure timesat these stops constrained by

t _(min)(i)≦t _(arr)(D _(i))≦t _(max)(i)−Δt _(i)

t _(arr)(D _(i))+Δt _(i) ≦t _(dep)(D _(i))≦t _(max)(i) i=1, . . . , M−1

where t_(arr)(D_(i)), t_(dep)(D_(i)), and Δt_(i) are the arrival,departure, and minimum stop time at the i^(th) stop, respectively.Assuming that fuel-optimality implies minimizing stop time, thereforet_(dep)(D_(i))=t_(arr)(D_(i))+Δt_(i) which eliminates the secondinequality above. Suppose for each i=1, . . . , M, the fuel-optimal tripfrom D_(i-1) to D_(i) for travel time t, T_(min)(i)≦t≦T_(max)(i), isknown. Let F_(i)(t) be the fuel-use corresponding to this trip. If thetravel time from D_(j-1) to D_(j) is denoted T_(j), then the arrivaltime at D_(i) is given by

${i.\mspace{14mu} {t_{arr}\left( D_{i} \right)}} = {\sum\limits_{j = 1}^{i}\; \left( {T_{j} + {\Delta \; t_{j - 1}}} \right)}$

where Δt₀ is defined to be zero. The fuel-optimal trip from D₀ to D_(M)for travel time T is then obtained by finding T_(i), i=1, . . . , M,which minimize

${{ii}.\mspace{14mu} {\sum\limits_{i = 1}^{M}\; {{F_{i}\left( T_{i} \right)}\mspace{20mu} {T_{\min}(i)}}}} \leq T_{i} \leq {T_{\max}(i)}$

subject to

$\begin{matrix}{{{{{{iii}.\mspace{14mu} {t_{\min}(i)}} \leq {\sum\limits_{j = 1}^{i}\; \left( {T_{j} + {\Delta \; t_{j - 1}}} \right)} \leq {{t_{\max}(i)} - {\Delta \; t_{i}\mspace{34mu} i}}} = 1},\ldots \mspace{11mu},{M - 1}}\mspace{14mu}} \\{{{iv}.\mspace{14mu} {\sum\limits_{j = 1}^{M}\; \left( {T_{j} + {\Delta \; t_{j - 1}}} \right)}} = T}\end{matrix}$

Once a trip is underway, the issue is re-determining the fuel-optimalsolution for the remainder of a trip (originally from D₀ to D_(M) intime T) as the trip is traveled, but where disturbances precludefollowing the fuel-optimal solution. Let the current distance and speedbe x and v, respectively, where D_(i-1)<x≦D_(i). Also, let the currenttime since the beginning of the trip be t_(act). Then the fuel-optimalsolution for the remainder of the trip from x to D_(M), which retainsthe original arrival time at D_(M), is obtained by finding {tilde over(T)}_(i), T_(j), j=i+1, . . . M, which minimize

${i.\mspace{14mu} {{\overset{\sim}{F}}_{i}\left( {{\overset{\sim}{T}}_{i},x,v} \right)}} + {\sum\limits_{j = {i + 1}}^{M}\; {F_{j}\left( T_{j} \right)}}$

subject to

$\begin{matrix}{{{ii}.\mspace{14mu} {t_{\min}(i)}} \leq {t_{act} + {\overset{\sim}{T}}_{i}} \leq {{t_{\max}(i)} - {\Delta \; t_{i}}}} \\{{{iii}.\mspace{14mu} {t_{\min}(k)}} \leq {t_{act} + {\overset{\sim}{T}}_{i} + {\sum\limits_{j = {i + 1}}^{k}\; \left( {T_{j} + {\Delta \; t_{j - 1}}} \right)}} \leq {{t_{\max}(k)} - {\Delta \; t_{k}}}} \\{{k = {i + 1}},\ldots \mspace{11mu},{M - 1}} \\{{{{iv}.\mspace{14mu} t_{act}} + {\overset{\sim}{T}}_{i} + {\sum\limits_{j = {i + 1}}^{M}\; \left( {T_{j} + {\Delta \; t_{j - 1}}} \right)}} = T}\end{matrix}$

Here, {tilde over (F)}_(i)(t,x,v) is the fuel-used of the optimal tripfrom x to D_(i), traveled in time t, with initial speed at x of v.

As discussed above, an exemplary way to enable more efficientre-planning is to construct the optimal solution for a stop-to-stop tripfrom partitioned segments. For the trip from D_(i-1) to D_(i), withtravel time T_(i), choose a set of intermediate points D_(ij), j=1, . .. , N_(i)−1. Let D_(i0)=D_(i-1) and D_(iN) _(i) =D_(i). Then express thefuel-use for the optimal trip from D_(i-1) to D_(i) as

${i.\mspace{14mu} {F_{i}(t)}} = {\sum\limits_{j = 1}^{N_{i}}\; {f_{ij}\left( {{t_{ij} - t_{i,{j - 1}}},v_{i,{j - 1}},v_{ij}} \right)}}$

where f_(ij)(t,v_(i,j-1),v_(ij)) is the fuel-use for the optimal tripfrom D_(i,j-1) to D_(ij), traveled in time t, with initial and finalspeeds of v_(i,j-1) and v_(ij). Furthermore, t_(ij) is the time in theoptimal trip corresponding to distance D_(ij). By definition, t_(iN)_(i) −t_(i0)=T_(i). Since the train is stopped at D_(i0) and D_(iN) _(i), v_(i0)=v_(iN) _(i) =0.

The above expression enables the function F_(i)(t) to be alternativelydetermined by first determining the functions f_(ij)(•), 1≦j≦N_(i), thenfinding τ_(ij), 1≦j≦N_(i) and v_(ij), 1≦j<N_(i), which minimize

${i.\mspace{14mu} {F_{i}(t)}} = {\sum\limits_{j = 1}^{N_{i}}\; {f_{ij}\left( {\tau_{ij},v_{i,{j - 1}},v_{ij}} \right)}}$

subject to

$\begin{matrix}{{{ii}.\mspace{14mu} {\sum\limits_{j = 1}^{N_{i}}\; \tau_{ij}}} = T_{i}} \\{{{{{iii}.\mspace{14mu} {v_{\min}\left( {i,j} \right)}} \leq v_{ij} \leq {{v_{\max}\left( {i,j} \right)}\mspace{20mu} j}} = 1},\ldots \mspace{11mu},{N_{i} - 1}} \\{{{iv}.\mspace{14mu} v_{i\; 0}} = {v_{{iN}_{i}} = 0}}\end{matrix}$

By choosing D_(ij) (e.g., at speed restrictions or meeting points),v_(max)(i,j)−v_(min)(i,j) can be minimized, thus minimizing the domainover which f_(ij)( ) needs to be known.

Based on the partitioning above, a simpler suboptimal re-planningapproach than that described above is to restrict re-planning to timeswhen the train is at distance points D_(ij), 1≦i≦M, 1≦j≦N_(i). At pointD_(ij), the new optimal trip from D_(ij) to D_(M) can be determined byfinding τ_(ik), j<k≦N_(i), v_(ik), j<k<N_(i), and τ_(mn), i<m≦M,1≦n≦N_(m), v_(mn), i<m≦M, 1≦n<N_(m), which minimize

${{i.\mspace{14mu} {\sum\limits_{k = {j + 1}}^{N_{i}}\; {f_{ik}\left( {\tau_{ik},v_{i,{k - 1}},v_{ik}} \right)}}} + {\sum\limits_{m = {i + 1}}^{M}\; {\sum\limits_{n = 1}^{N_{m}}\; {f_{mn}\left( {\tau_{mn},v_{m,{n - 1}},v_{mn}} \right)}}}}\mspace{14mu}$

subject to

$\begin{matrix}{{{ii}.\mspace{14mu} {t_{\min}(i)}} \leq {t_{act} + {\sum\limits_{k = {j + 1}}^{N_{i}}\; \tau_{ik}}} \leq {{t_{\max}(i)} - {\Delta t}_{i}}} \\{{{iii}.\mspace{14mu} {t_{\min}(n)}} \leq {t_{act} + {\sum\limits_{k = {j + 1}}^{N_{i}}\; \tau_{ik}} + {\sum\limits_{m = {i + 1}}^{n}\; \left( {T_{m} + {\Delta \; t_{m - 1}}} \right)}} \leq {{t_{\max}(n)} - {\Delta \; t_{n}}}} \\{{n = {i + 1}},\ldots \mspace{11mu},{M - 1}} \\{{{{iv}.\mspace{14mu} t_{act}} + {\sum\limits_{k = {j + 1}}^{N_{i}}\; \tau_{ik}} + {\sum\limits_{m = {i + 1}}^{M}\; \left( {T_{m} + {\Delta \; t_{m - 1}}} \right)}} = T}\end{matrix}$

where

${v.\mspace{14mu} T_{m}} = {\sum\limits_{n = 1}^{N_{m}}\; \tau_{mn}}$

A further simplification is obtained by waiting on the re-computation ofT_(m), i<m≦M, until distance point D_(i) is reached. In this way, atpoints D_(ij) between D_(i-1) and D_(i), the minimization above needsonly be performed over τ_(ik), j<k≦N_(i), v_(ik), j<k<N_(i). T_(i) isincreased as needed to accommodate any longer actual travel time fromD_(i-1) to D_(ij) than planned. This increase is later compensated, ifpossible, by the re-computation of T_(m), i<m≦M, at distance pointD_(i).

With respect to the closed-loop configuration disclosed above, the totalinput energy required to move a train 31 from point A to point Bconsists of the sum of four components, specifically difference inkinetic energy between points A and B; difference in potential energybetween points A and B; energy loss due to friction and other draglosses; and energy dissipated by the application of brakes. Assuming thestart and end speeds to be equal (e.g., stationary), the first componentis zero. Furthermore, the second component is independent of drivingstrategy. Thus, it suffices to minimize the sum of the last twocomponents.

Following a constant speed profile minimizes drag loss. Following aconstant speed profile also minimizes total energy input when braking isnot needed to maintain constant speed. However, if braking is requiredto maintain constant speed, applying braking just to maintain constantspeed will most likely increase total required energy because of theneed to replenish the energy dissipated by the brakes. A possibilityexists that some braking may actually reduce total energy usage if theadditional brake loss is more than offset by the resultant decrease indrag loss caused by braking, by reducing speed variation.

After completing a re-plan from the collection of events describedabove, the new optimal notch/speed plan can be followed using the closedloop control described herein. However, in some situations there may notbe enough time to carry out the segment decomposed planning describedabove, and particularly when there are critical speed restrictions thatmust be respected, an alternative is needed. Exemplary embodiments ofthe present invention accomplish this with an algorithm referred to as“smart cruise control”. The smart cruise control algorithm is anefficient way to generate, on the fly, an energy-efficient (hencefuel-efficient) sub-optimal prescription for driving the train 31 over aknown terrain. This algorithm assumes knowledge of the position of thetrain 31 along the track 34 at all times, as well as knowledge of thegrade and curvature of the track versus position. The method relies on apoint-mass model for the motion of the train 31, whose parameters may beadaptively estimated from online measurements of train motion asdescribed earlier.

The smart cruise control algorithm has three principal components,specifically a modified speed limit profile that serves as anenergy-efficient (and/or emissions efficient or any other objectivefunction) guide around speed limit reductions; an ideal throttle ordynamic brake setting profile that attempts to balance betweenminimizing speed variation and braking; and a mechanism for combiningthe latter two components to produce a notch command, employing a speedfeedback loop to compensate for mismatches of modeled parameters whencompared to reality parameters. Smart cruise control can accommodatestrategies in exemplary embodiments of the present invention that do noactive braking (i.e. the driver is signaled and assumed to provide therequisite braking) or a variant that does active braking.

With respect to the cruise control algorithm that does not controldynamic braking, the three exemplary components are a modified speedlimit profile that serves as an energy-efficient guide around speedlimit reductions, a notification signal directed to notify the operatorwhen braking should be applied, an ideal throttle profile that attemptsto balance between minimizing speed variations and notifying theoperator to apply braking, a mechanism employing a feedback loop tocompensate for mismatches of model parameters to reality parameters.

Also included in exemplary embodiments of the present invention is anapproach to identify key parameter values of the train 31. For example,with respect to estimating train mass, a Kalman filter and a recursiveleast-squares approach may be utilized to detect errors that may developover time.

FIG. 7 depicts an exemplary flow chart of the present invention. Asdiscussed previously, a remote facility, such as a dispatch 60 canprovide information. As illustrated, such information is provided to anexecutive control element 62. Also supplied to the executive controlelement 62 is locomotive modeling information database 63, informationfrom a track database 36 such as, but not limited to, track gradeinformation and speed limit information, estimated train parameters suchas, but not limited to, train weight and drag coefficients, and fuelrate tables from a fuel rate estimator 64. The executive control element62 supplies information to the planner 12, which is disclosed in moredetail in FIG. 1. Once a trip plan has been calculated, the plan issupplied to a driving advisor, driver or controller element 51. The tripplan is also supplied to the executive control element 62 so that it cancompare the trip when other new data is provided.

As discussed above, the driving advisor 51 can automatically set a notchpower, either a pre-established notch setting or an optimum continuousnotch power. In addition to supplying a speed command to the locomotive31, a display 68 is provided so that the operator can view what theplanner has recommended. The operator also has access to a control panel69. Through the control panel 69 the operator can decide whether toapply the notch power recommended. Towards this end, the operator maylimit a targeted or recommended power. That is, at any time the operatoralways has final authority over what power setting the locomotiveconsist will operate at. This includes deciding whether to apply brakingif the trip plan recommends slowing the train 31. For example, ifoperating in dark territory, or where information from wayside equipmentcannot electronically transmit information to a train and instead theoperator views visual signals from the wayside equipment, the operatorinputs commands based on information contained in track database andvisual signals from the wayside equipment. Based on how the train 31 isfunctioning, information regarding fuel measurement is supplied to thefuel rate estimator 64. Since direct measurement of fuel flows is nottypically available in a locomotive consist, all information on fuelconsumed so far within a trip and projections into the future followingoptimal plans is carried out using calibrated physics models such asthose used in developing the optimal plans. For example, suchpredictions may include but are not limited to, the use of measuredgross horse-power and known fuel characteristics and emissionscharacteristics to derive the cumulative fuel used and emissionsgenerated.

The train 31 also has a locator device 30 such as a GPS sensor, asdiscussed above. Information is supplied to the train parametersestimator 65. Such information may include, but is not limited to, GPSsensor data, tractive/braking effort data, braking status data, speedand any changes in speed data. With information regarding grade andspeed limit information, train weight and drag coefficients informationis supplied to the executive control element 62.

Exemplary embodiments of the present invention may also allow for theuse of continuously variable power throughout the optimization planningand closed loop control implementation. In a conventional locomotive,power is typically quantized to eight discrete levels. Modernlocomotives can realize continuous variation in horsepower which may beincorporated into the previously described optimization methods. Withcontinuous power, the locomotive 42 can further optimize operatingconditions, e.g., by minimizing auxiliary loads and power transmissionlosses, and fine tuning engine horsepower regions of optimum efficiency,or to points of increased emissions margins. Example include, but arenot limited to, minimizing cooling system losses, adjusting alternatorvoltages, adjusting engine speeds, and reducing number of powered axles.Further, the locomotive 42 may use the on-board track database 36 andthe forecasted performance requirements to minimize auxiliary loads andpower transmission losses to provide optimum efficiency for the targetfuel consumption/emissions. Examples include, but are not limited to,reducing a number of powered axles on flat terrain and pre-cooling thelocomotive engine prior to entering a tunnel.

Exemplary embodiments of the present invention may also use the on-boardtrack database 36 and the forecasted performance to adjust thelocomotive performance, such as to insure that the train has sufficientspeed as it approaches a hill and/or tunnel. For example, this could beexpressed as a speed constraint at a particular location that becomespart of the optimal plan generation created solving the equation (OP).Additionally, exemplary embodiments of the present invention mayincorporate train-handling rules, such as, but not limited to, tractiveeffort ramp rates, maximum braking effort ramp rates. These may beincorporated directly into the formulation for optimum trip profile oralternatively incorporated into the closed loop regulator used tocontrol power application to achieve the target speed.

In a preferred embodiment the present invention is only installed on alead locomotive of the train consist. Even though exemplary embodimentsof the present invention are not dependant on data or interactions withother locomotives, it may be integrated with a consist manager, asdisclosed in U.S. Pat. No. 6,691,957 and U.S. Pat. No. 7,021,588 (ownedby the Assignee and both incorporated by reference), functionalityand/or a consist optimizer functionality to improve efficiency.Interaction with multiple trains is not precluded as illustrated by theexample of dispatch arbitrating two “independently optimized” trainsdescribed herein.

Trains with distributed power systems can be operated in differentmodes. One mode is where all locomotives in the train operate at thesame notch command. So if the lead locomotive is commanding motoring—N8,all units in the train will be commanded to generate motoring—N8 power.Another mode of operation is “independent” control. In this mode,locomotives or sets of locomotives distributed throughout the train canbe operated at different motoring or braking powers. For example, as atrain crests a mountaintop, the lead locomotives (on the down slope ofmountain) may be placed in braking, while the locomotives in the middleor at the end of the train (on the up slope of mountain) may be inmotoring. This is done to minimize tensile forces on the mechanicalcouplers that connect the railcars and locomotives. Traditionally,operating the distributed power system in “independent” mode requiredthe operator to manually command each remote locomotive or set oflocomotives via a display in the lead locomotive. Using the physicsbased planning model, train set-up information, on-board track database,on-board operating rules, location determination system, real-timeclosed loop power/brake control, and sensor feedback, the system shallautomatically operate the distributed power system in “independent”mode.

When operating in distributed power, the operator in a lead locomotivecan control operating functions of remote locomotives in the remoteconsists via a control system, such as a distributed power controlelement. Thus when operating in distributed power, the operator cancommand each locomotive consist to operate at a different notch powerlevel (or one consist could be in motoring and other could be inbraking) wherein each individual locomotive in the locomotive consistoperates at the same notch power. In an exemplary embodiment, with anexemplary embodiment of the present invention installed on the train,preferably in communication with the distributed power control element,when a notch power level for a remote locomotive consist is desired asrecommended by the optimized trip plan, the exemplary embodiment of thepresent invention will communicate this power setting to the remotelocomotive consists for implementation. As discussed below, the same istrue regarding braking.

Exemplary embodiments of the present invention may be used with consistsin which the locomotives are not contiguous, e.g., with 1 or morelocomotives up front, others in the middle and at the rear for train.Such configurations are called distributed power wherein the standardconnection between the locomotives is replaced by radio link orauxiliary cable to link the locomotives externally. When operating indistributed power, the operator in a lead locomotive can controloperating functions of remote locomotives in the consist via a controlsystem, such as a distributed power control element. In particular, whenoperating in distributed power, the operator can command each locomotiveconsist to operate at a different notch power level (or one consistcould be in motoring and other could be in braking) wherein eachindividual in the locomotive consist operates at the same notch power.

In an exemplary embodiment, with an exemplary embodiment of the presentinvention installed on the train, preferably in communication with thedistributed power control element, when a notch power level for a remotelocomotive consist is desired as recommended by the optimized trip plan,the exemplary embodiment of the present invention will communicate thispower setting to the remote locomotive consists for implementation. Asdiscussed below, the same is true regarding braking. When operating withdistributed power, the optimization problem previously described can beenhanced to allow additional degrees of freedom, in that each of theremote units can be independently controlled from the lead unit. Thevalue of this is that additional objectives or constraints relating toin-train forces may be incorporated into the performance function,assuming the model to reflect the in-train forces is also included. Thusexemplary embodiments of the present invention may include the use ofmultiple throttle controls to better manage in-train forces as well asfuel consumption and emissions.

In a train utilizing a consist manager, the lead locomotive in alocomotive consist may operate at a different notch power setting thanother locomotives in that consist. The other locomotives in the consistoperate at the same notch power setting. Exemplary embodiments of thepresent invention may be utilized in conjunction with the consistmanager to command notch power settings for the locomotives in theconsist. Thus based on exemplary embodiments of the present invention,since the consist manager divides a locomotive consist into two groups,lead locomotive and trail units, the lead locomotive will be commandedto operate at a certain notch power and the trail locomotives arecommanded to operate at another certain notch power. In an exemplaryembodiment the distributed power control element may be the systemand/or apparatus where this operation is housed.

Likewise, when a consist optimizer is used with a locomotive consist,exemplary embodiments of the present invention can be used inconjunction with the consist optimizer to determine notch power for eachlocomotive in the locomotive consist. For example, suppose that a tripplan recommends a notch power setting of 4 for the locomotive consist.Based on the location of the train, the consist optimizer will take thisinformation and then determine the notch power setting for eachlocomotive in the consist. In this implementation, the efficiency ofsetting notch power settings over intra-train communication channels isimproved. Furthermore, as discussed above, implementation of thisconfiguration may be performed utilizing the distributed control system.

Furthermore, as discussed previously, exemplary embodiment of thepresent invention may be used for continuous corrections and re-planningwith respect to when the train consist uses braking based on upcomingitems of interest, such as but not limited to railroad crossings, gradechanges, approaching sidings, approaching depot yards, and approachingfuel stations where each locomotive in the consist may require adifferent braking option. For example, if the train is coming over ahill, the lead locomotive may have to enter a braking condition whereasthe remote locomotives, having not reached the peak of the hill may haveto remain in a motoring state.

FIGS. 8, 9 and 10 depict exemplary illustrations of dynamic displays foruse by the operator. As provided, FIG. 8, a trip profile is provided 72.Within the profile a location 73 of the locomotive is provided. Suchinformation as train length 105 and the number of cars 106 in the trainis provided. Elements are also provided regarding track grade 107, curveand wayside elements 108, including bridge location 109, and train speed110. The display 68 allows the operator to view such information andalso see where the train is along the route. Information pertaining todistance and/or estimate time of arrival to such locations as crossings112, signals 114, speed changes 116, landmarks 118, and destinations 120is provided. An arrival time management tool 125 is also provided toallow the user to determine the fuel savings that is being realizedduring the trip. The operator has the ability to vary arrival times 127and witness how this affects the fuel savings. As discussed herein,those skilled in the art will recognize that fuel saving is an exemplaryexample of only one objective that can be reviewed with a managementtool. Towards this end, depending on the parameter being viewed, otherparameters, discussed herein can be viewed and evaluated with amanagement tool that is visible to the operator. The operator is alsoprovided information about how long the crew has been operating thetrain. In exemplary embodiments time and distance information may eitherbe illustrated as the time and/or distance until a particular eventand/or location or it may provide a total elapsed time.

As illustrated in FIG. 9 an exemplary display provides information aboutconsist data 130, an events and situation graphic 132, an arrival timemanagement tool 134, and action keys 136. Similar information asdiscussed above is provided in this display as well. This display 68also provides action keys 138 to allow the operator to re-plan as wellas to disengage 140 exemplary embodiments of the present invention.

FIG. 10 depicts another exemplary embodiment of the display. Datatypical of a modern locomotive including air-brake status 72, analogspeedometer with digital inset 74, and information about tractive effortin pounds force (or traction amps for DC locomotives) is visible. Anindicator 74 is provided to show the current optimal speed in the planbeing executed as well as an accelerometer graphic to supplement thereadout in mph/minute. Important new data for optimal plan execution isin the center of the screen, including a rolling strip graphic 76 withoptimal speed and notch setting versus distance compared to the currenthistory of these variables. In this exemplary embodiment, location ofthe train is derived using the locator element. As illustrated, thelocation is provided by identifying how far the train is away from itsfinal destination, an absolute position, an initial destination, anintermediate point, and/or an operator input.

The strip chart provides a look-ahead to changes in speed required tofollow the optimal plan, which is useful in manual control, and monitorsplan versus actual during automatic control. As discussed herein, suchas when in the coaching mode, the operator can either follow the notchor speed suggested by exemplary embodiments of the present invention.The vertical bar gives a graphic of desired and actual notch, which arealso displayed digitally below the strip chart. When continuous notchpower is utilized, as discussed above, the display will simply round toclosest discrete equivalent, the display may be an analog display sothat an analog equivalent or a percentage or actual horse power/tractiveeffort is displayed.

Critical information on trip status is displayed on the screen, andshows the current grade the train is encountering 88, either by the leadlocomotive, a location elsewhere along the train or an average over thetrain length. A distance traveled so far in the plan 90, cumulative fuelused 92, where or the distance away the next stop is planned 94, currentand projected arrival time 96 expected time to be at next stop are alsodisclosed. The display 68 also shows the maximum possible time todestination possible with the computed plans available. If a laterarrival was required, a re-plan would be carried out. Delta plan datashows status for fuel and schedule ahead or behind the current optimalplan. Negative numbers mean less fuel or early compared to plan,positive numbers mean more fuel or late compared to plan, and typicallytrade-off in opposite directions (slowing down to save fuel makes thetrain late and conversely).

At all times these displays 68 gives the operator a snapshot of where hestands with respect to the currently instituted driving plan. Thisdisplay is for illustrative purpose only as there are many other ways ofdisplaying/conveying this information to the operator and/or dispatch.Towards this end, the information disclosed above could be intermixed toprovide a display different than the ones disclosed.

Other features that may be included in exemplary embodiments of thepresent invention include, but are not limited to, allowing for thegenerating of data logs and reports. This information may be stored onthe train and downloaded to an off-board system at some point in time.The downloads may occur via manual and/or wireless transmission. Thisinformation may also be viewable by the operator via the locomotivedisplay. The data may include such information as, but not limited to,operator inputs, time system is operational, fuel saved, fuel imbalanceacross locomotives in the train, train journey off course, systemdiagnostic issues such as if GPS sensor is malfunctioning.

Since trip plans must also take into consideration allowable crewoperation time, exemplary embodiments of the present invention may takesuch information into consideration as a trip is planned. For example,if the maximum time a crew may operate is eight hours, then the tripshall be fashioned to include stopping location for a new crew to takethe place of the present crew. Such specified stopping locations mayinclude, but are not limited to rail yards, meet/pass locations, etc.If, as the trip progresses, the trip time may be exceeded, exemplaryembodiments of the present invention may be overridden by the operatorto meet criteria as determined by the operator. Ultimately, regardlessof the operating conditions of the train, such as but not limited tohigh load, low speed, train stretch conditions, etc., the operatorremains in control to command a speed and/or operating condition of thetrain.

Using exemplary embodiments of the present invention, the train mayoperate in a plurality of operations. In one operational concept, anexemplary embodiment of the present invention may provide commands forcommanding propulsion, dynamic braking. The operator then handles allother train functions. In another operational concept, an exemplaryembodiment of the present invention may provide commands for commandingpropulsion only. The operator then handles dynamic braking and all othertrain functions. In yet another operational concept, an exemplaryembodiment of the present invention may provide commands for commandingpropulsion, dynamic braking and application of the airbrake. Theoperator then handles all other train functions.

Exemplary embodiments of the present invention may also be used bynotify the operator of upcoming items of interest of actions to betaken. Specifically, the forecasting logic of exemplary embodiments ofthe present invention, the continuous corrections and re-planning to theoptimized trip plan, the track database, the operator can be notified ofupcoming crossings, signals, grade changes, brake actions, sidings, railyards, fuel stations, etc. This notification may occur audibly and/orthrough the operator interface.

Specifically using the physics based planning model, train set-upinformation, on-board track database, on-board operating rules, locationdetermination system, real-time closed loop power/brake control, andsensor feedback, the system shall present and/or notify the operator ofrequired actions. The notification can be visual and/or audible.Examples include notifying of crossings that require the operatoractivate the locomotive horn and/or bell, notifying of “silent”crossings that do not require the operator activate the locomotive hornor bell.

In another exemplary embodiment, using the physics based planning modeldiscussed above, train set-up information, on-board track database,on-board operating rules, location determination system, real-timeclosed power/brake control, and sensor feedback, exemplary embodimentsof the present invention may present the operator information (e.g. agauge on display) that allows the operator to see when the train willarrive at various locations as illustrated in FIG. 9. The system shallallow the operator to adjust the trip plan (target arrival time). Thisinformation (actual estimated arrival time or information needed toderive off-board) can also be communicated to the dispatch center toallow the dispatcher or dispatch system to adjust the target arrivaltimes. This allows the system to quickly adjust and optimize for theappropriate target function (for example trading off speed and fuelusage).

FIG. 11 depicts an exemplary embodiment of a network of railway trackswith multiple trains. In the railroad network 200, it is desirable toobtain an optimized fuel efficiency and time of arrival for the overallnetwork of multiple interacting tracks 210, 220, 230, and trains 235,236, 237. As illustrated multiple tracks 210, 220, 230 are shown with atrain 235, 236, 237 on each respective track. Though locomotive consists42 are illustrated as part of the trains 235, 236, 237, those skilled inthe art will readily recognize that any train may only have a singlelocomotive consist having a single locomotive. As disclosed herein, aremote facility 240 may also be involved with improving fuel efficiencyand reducing emissions of a train through optimized train power makeup.This may be accomplished with a processor 245, such as a computer,located at the remote facility 240. In another exemplary embodiment ahand-held device 250 may be used to facilitate improving fuel efficiencyof the train 235, 236, 237 through optimized train power makeup.Typically in either of these approaches, configuring the train 235, 236,237 usually occurs at a hump, or rail, yard, more specifically when thetrain is being compiled.

However as discussed below, the processor 245 may be located on thetrain 235, 236, 237 or aboard another train wherein train setup may beaccomplished using inputs from the other train. For example, if a trainhas recently completed a mission over the same tracks, input from thattrain's mission may be supplied to the current train as it either isperforming and/or is about to begin its mission. Thus configuring thetrain may occur at train run time, and even during the run time. Forexample, real time configuration data may be utilized to configure thetrain locomotives. One such example is provided above with respect tousing data from another train. Another exemplary example entails usingother data associated with trip optimization of the train as discussedabove. Additionally the train setup may be performed using input from aplurality of sources, such as, but not limited to, a dispatch system, awayside system 270, an operator, an off-line real time system, anexternal setup, a distributed network, a local network, and/or acentralized network.

FIG. 12 depicts an exemplary embodiment of a flowchart illustratingsteps for improving fuel efficiency and reducing emission output throughoptimized train power makeup. As disclosed above to minimize fuel useand emissions while preserving time arrival, in an exemplary embodimentacceleration and matched breaking needs to be minimized. Undesiredemissions may also be minimized by powering a minimal set oflocomotives. For example, in a train with several locomotives orlocomotive consists, powering a minimal set of locomotives at a higherpower setting while putting the remaining locomotives into idle,unpowered standby, or an automatic engine start-stop (“AESS) mode asdiscussed below, will reduce emissions. This is due, in part, because atlower power setting such as notch 1-3, exhaust emissions after-treatmentdevices, such as but not limited to catalytic converters, located on thelocomotives are at a temperature below which these systems' operationsare optimal. Therefore, using the minimum number of locomotives orlocomotive consists to make the mission on time, operating at high powersettings will allow for the exhaust emission treatment devices, such asbut not limited to catalytic converters, to operate at optimaltemperatures thus further reducing emissions.

As illustrated one step in the flow chart 500 provides for determining atrain load, step 510. When the engine is used in other applications, theload is determined based on the engine configuration. The train load maybe determined with a load, or train load, estimator 560, as illustratedin FIG. 13. In an exemplary embodiment the train load is estimated basedon information obtained as disclosed in a train makeup docket 480, asillustrated in FIG. 11. For example, the train makeup docket 480 may becontained in the computer 245 (illustrated in FIGS. 11 & 13) wherein theprocessor 245 makes the estimation, or may be on paper wherein anoperator makes the estimation. The train makeup docket 480 may includesuch information as, but not limited to, number of cars, weight of thecars, content of the cars, age of cars, etc. In another exemplaryembodiment the train load is estimated using historical data, such asbut not limited to prior train missions making the same trip, similartrain car configurations, etc. As discussed above, using historical datamay be accomplished with a processor or manually. In yet anotherexemplary embodiment, the train load is estimated using a rule of thumbor table data. For example, the operator configuring the train 235, 236,237 may determine the train load required based on established guidelinesuch as, but not limited to, a number of cars in the train, types ofcars in the train, weight of the cars in the train, an amount ofproducts being transported by the train, etc. This same rule of thumbdetermination may also be accomplished using the processor 245.

Another step includes identifying a mission time and/or duration for thediesel power system, step 520. With respect to engines used in otherapplications, this step equates to defining the mission time which theengine configuration is expected to accomplish the mission. Adetermination is made about a minimum total amount of power requiredbased on the train load, step 530. The locomotive is selected to satisfythe minimum required power while yielding improved fuel efficiencyand/or minimized emission output, step 540. The locomotive may beselected based on a type of locomotive (based on its engine) neededand/or a number of locomotives (based on a number of engines) needed.Similarly, with respect to diesel engines used in other powerapplications, such as but not limited to marine, OHV, and stationarypower stations, where multiple units of each are used to accomplish anintended mission unique for the specific application.

Towards this end, a trip mission time determinator 570, as illustratedin FIG. 13, may be used to determine the mission time. Such informationthat may be used includes, but not limited to, weather conditions, trackconditions, etc. The locomotive makeup may be based on types oflocomotives needed, such as based on power output, and/or a minimumnumber of locomotives needed. For example, based on the availablelocomotives, a selection is made of those locomotives that just meet thetotal power required. Towards this end, as an example, if tenlocomotives are available, a determination of the power output from eachlocomotive is made. Based on this information, the fewest number andtype of locomotives needed to meet the total power requirements areselected. For example the locomotives may have different horse power(HP) ratings or starting Tractive Effort (TE) ratings. In addition tothe total power required, the distribution of power and type of power inthe train can be determined. For example on heavy trains to limit themaximum coupler forces, the locomotives may be distributed within thetrain. Another consideration is the capability of the locomotive. It maybe possible to put 4 DC locomotives on the head end of a train, however4 AC units with the same HP may not be used at the headend since thetotal drawbar forces may exceed the limits.

In another exemplary embodiment, the selection of locomotives may not bebased solely on reducing a number of locomotives used in a train. Forexample, if the total power requirement is minimally met by five of theavailable locomotives when compared to also meeting the powerrequirement by the use of three of the available locomotives, the fivelocomotives are used instead of the three. In view of these options,those skilled in the art will readily recognize that minimum number oflocomotives may be selected from a sequential (and random) set ofavailable locomotives. Such an approach may be used when the train 235,236, 237 is already compiled and a decision is being made at run timeand/or during a mission wherein the remaining locomotives are not usedto power the train 235, 236, 237, as discussed in further detail below.

While compiling the train 235, 236, 237, if the train 235, 236, 237requires backup power, incremental locomotive 255, or locomotives, maybe added. However this additional locomotive 255 is isolated to minimizefuel use, emission output, and power variation, but may be used toprovide backup power in case an operating locomotive fails, and/or toprovide additional power to accomplish the trip within an establishedmission time. The isolated locomotive 255 may be put into an AESS modeto minimize fuel use and having the locomotive available when needed. Inan exemplary embodiment, if a backup, or isolated, locomotive 255 isprovided, its dimensions, such as weight, may be taken intoconsideration when determining the train load.

Thus, as discussed above in more detail, determining minimum powerneeded to power the train 235, 236, 237 may occur at train run timeand/or during a run (or mission). In this instance once a determinationis made as to optimized train power and the locomotives or locomotiveconsists 42 in the train 235, 236, 237 are identified to provide therequisite power needed, the additional locomotive(s) 255 not identifiedfor use are put in the idle, or AESS, mode.

In an exemplary embodiment, the total mission run may be broken into aplurality of sections, or segments, such as but not limited to at least2 segments, such as segment A and segment B as illustrated in FIG. 11.Based on the amount of time taken to complete any segment the backuppower, provided by the isolated locomotive 255, is provided in caseincremental power is needed to meet the trip mission objective. Towardsthis end, the isolated locomotive 255 may be utilized for a specifictrip segment to get the train 235, 236, 237 back on schedule and thenswitched off for the following segments, if the train 235, 236, 237remains on schedule.

Thus in operation, the lead locomotive may put the locomotive 255provided for incremental power into an isolate mode until the power isneeded. This may be accomplished by use of wired or wireless modems orcommunications from the operator, usually on the lead locomotive, to theisolated locomotive 255. In another exemplary embodiment the locomotivesoperate in a distributed power configuration and the isolated locomotive255 is already integrated in the distributed power configuration, but isidle, and is switched on when the additional power is required. In yetanother embodiment the operator puts the isolated locomotive 255 intothe appropriate mode.

In an exemplary embodiment the initial setup of the locomotives, basedon train load and mission time, is updated by the trip optimizer, asdisclosed in above, and adjustments to the number and type of poweredlocomotives are made. As an exemplary illustration, consider alocomotive consist 42 of 3 locomotives having relative available maximumpower of 1, 1.5 and 0.75, respectively. Relative available power isrelative to a reference locomotive; railroads use ‘reference’locomotives to determine the total consist power; this could be a ‘3000HP’ reference locomotive; hence, in this example the first locomotivehas 3000 HP, the second 4500 HP and the third 2250 HP). Suppose that themission is broken into seven segments. Given the above scenario thefollowing combinations are available and can be matched to the tracksection load, 0.75, 1, 1.5, 1.75, 2.25, 2.5, 3.25, which is thecombination of maximum relative HP settings for the consist. Thus foreach respective relative HP setting mentioned above, for 0.75 the thirdlocomotive is on and the first and second are off, for 1 the firstlocomotive is on and the second and third are off, etc. In a preferredembodiment the trip optimizer selects the maximum required load andadjusts via notch calls while minimizing an overlap of power settings.Hence, if a segment calls for between 2 and 2.5 (times 3000 HP) thenlocomotive 1 and locomotive 2 are used while locomotive 3 is in eitheridle or in standby mode, depending on the time it is in this segment andthe restart time of the locomotive.

In another exemplary embodiment, an analysis may be performed todetermine a trade off between emission output and locomotive powersettings to maximize higher notch operation where the emissions from theexhaust after treatment devices are more optimal. This analysis may alsotake into consideration one of the other parameters discussed aboveregarding train operation optimization. This analysis may be performedfor an entire mission run, segments of a mission run, and/orcombinations of both.

FIG. 13 depicts a block diagram of exemplary elements included in asystem for optimized train power makeup. As illustrated and discussedabove, a train load estimator 560 is provided. A trip mission timedeterminator 570 is also provided. A processor 240 is also provided. Asdisclosed above, though directed at a train, similar elements may beused for other engines not being used within a rail vehicle, such as butnot limited to off-highway vehicles, marine vessels, and stationaryunits. The processor 240 calculates a total amount of power required topower the train 235, 236, 237 based on the train load determined by thetrain load estimator 560 and a trip mission time determined by the tripmission time determinator 570. A determination is further made of a typeof locomotive needed and/or a number of locomotives needed, based oneach locomotive power output, to minimally achieve the minimum totalamount of power required based on the train load and trip mission time.

The trip mission time determinator 570 may segment the mission into aplurality of mission segments, such as but not limited to segment A andsegment B, as discussed above. The total amount of power may then beindividually determined for each segment of the mission. As furtherdiscussed above, an additional locomotive 255 is part of the train 235,236, 237 and is provided for back up power. The power from the back-uplocomotive 255 may be used incrementally as a required is identified,such as but not limited to providing power to get the train 235, 236,237 back on schedule for a particular trip segment. In this situation,the train 235, 236, 237 is operated to achieve and/or meet the tripmission time.

The train load estimator 560 may estimate the train load based oninformation contained in the train makeup docket 480, historical data, arule of thumb estimation, and/or table data. Furthermore, the processor245 may determine a trade off between emission output and locomotivepower settings to maximize higher notch operation where the emissionsfrom the exhaust after-treatment devices are optimized.

FIG. 14 depicts a block diagram of a transfer function for determining afuel efficiency and emissions for a diesel powered system. Such dieselpowered systems include, but are not limited to locomotives, marinevessels, OHV, and/or stationary generating stations. As illustrated,information pertaining to input energy 580 (such as but not limited topower, waste heat, etc.) and information about an after treatmentprocess 583 are provided to a transfer function 585. The transferfunction 585 utilizes this information to determine an optimum fuelefficiency 587 and emission output 590.

FIG. 15 depicts a an exemplary embodiment of a flow chart illustratingsteps for determining a configuration of a diesel powered system havingat least one diesel-fueled power generating unit. The flow chart 600includes a step for determining a minimum power required from the dieselpowered system in order to accomplish a specified mission, step 605. Astep for determining an operating condition of the diesel-fueled powergenerating unit such that the minimum power requirement is satisfiedwhile yielding at least one of lower fuel consumption and loweremissions for the diesel powered system, step 610 is also disclosed. Asdisclosed above, this flow chart 600 is applicable for a plurality ofdiesel-fueled power generating units, such as but not limited to alocomotive, marine vessel, OHV, and/or stationary generating stations.Additionally, this flowchart 600 may be implemented using a computersoftware program.

FIG. 16 depicts an exemplary embodiment of a closed-loop system foroperating a rail vehicle. As illustrated, an optimizer 650, converter652, rail vehicle 653, and at least one output 654, such as but notlimited to speed, emissions, tractive effort, horse power, sand, etc.,are part of the closed-loop control communication system 657. The output654 may be determined by a sensor 656 which is part of the rail vehicle653, or in another exemplary embodiment independent of the rail vehicle653. Information initially derived from information generated from thetrip optimizer 650 and/or a regulator is provided to the rail vehicle653 through the converter 652. Locomotive data gathered by the sensor654 from the rail vehicle is then communicated 657 back to the optimizer650.

The optimizer 650 determines operating characteristics for at least onefactor that is to be regulated, such as but not limited to speed, fuel,emissions, etc. The optimizer 650 determines at least one of a powerand/or torque setting based on a determined optimized value. Theconverter 652 is provided to convert the power, torque, speed,emissions, sanding, setup, configurations etc., control inputs for therail vehicle 653, usually a locomotive. Specifically, this informationor data about power, torque, speed, emissions, sanding, setup,configurations etc., and/or control inputs is converted to an electricalsignal.

FIG. 17 depicts the closed loop system integrated with a master controlunit. As illustrated in further detail below, the converter 652 mayinterface with any one of a plurality of devices, such as but notlimited to a master controller, remote control locomotive controller, adistributed power drive controller, a train line modem, analog input,etc. The converter, for example, may disconnect the output of the mastercontroller 651. The master controller 651 is normally used by theoperator to command the locomotive, such as but not limited to power,horsepower, tractive effort, sanding, braking (including at least one ofdynamic braking, air brakes, hand brakes, etc.), propulsion, etc. levelsto the locomotive. Those skilled in the art will readily recognize thatthe master controller may be used to control both hard switches andsoftware based switches used in controlling the locomotive. Theconverter 652 then injects signals into the master controller 651. Thedisconnection of the master controller 651 may be electrical wires orsoftware switches or configurable input selection process etc. Aswitching device 655 is illustrated to perform this function.

As discussed above, the same technique may be used for other devices,such as but not limited to a control locomotive controller, adistributed power drive controller, a train line modem, analog input,etc. Though not illustrated, those skilled in the art readily recognizethat the master controller similarly could use these devices and theirassociated connections to the locomotive and use the input signals. TheCommunication system 657 for these other devices may be either wirelessor wired.

FIG. 18 depicts an exemplary embodiment of a closed-loop system foroperating a rail vehicle integrated with another input operationalsubsystem of the rail vehicle. For example the distributed power drivecontroller 659 may receive inputs from various sources 661, such as butnot limited to the operator, train lines, locomotive controllers andtransmit the information to locomotives in the remote positions. Theconverter 652 may provide information directly to input of the DPcontroller 659 (as an additional input) or break one of the inputconnections and transmit the information to the DP controller 659. Aswitch 655 is provided to direct how the converter 652 providesinformation to the DP controller 659 as discussed above. The switch 655may be a software-based switch and/or a wired switch. Additionally, theswitch 655 is not necessarily a two-way switch. The switch may have aplurality of switching directions based on the number of signals it iscontrolling.

In another exemplary embodiment the converter may command operation ofthe master controller, as illustrated in FIG. 19. The converter 652 hasa mechanical means for moving the master controller 651 automaticallybased on electrical signals received from the optimizer 650.

Sensors 654 are provided aboard the locomotive to gather operatingcondition data, such as but not limited to speed, emissions, tractiveeffort, horse power, etc. Locomotive output information 654 is thenprovided to the optimizer 650, usually through the rail vehicle 653,thus completing the closed loop system.

FIG. 20 depicts an exemplary flowchart of steps for operating a railvehicle in a closed-loop process. The flowchart 660 includes a step fordetermining an optimized setting for a locomotive consist, step 662. Theoptimized setting may include a setting for any setup variable such asbut not limited to at least one of power level, optimized torqueemissions, other locomotive configurations, etc. Another step providesfor converting the optimized power level and/or the torque setting to arecognizable input signal for the locomotive consist, step 664. At leastone operational condition of the locomotive consist is determined whenat least one of the optimized power level and the optimized torquesetting is applied, step 667. Another step involves communicating withina closed control loop to an optimizer the at least one operationalcondition so that the at least operational condition is used to furtheroptimize at least one of power level and torque setting, step 668.

As disclosed above, steps illustrated in this flowchart 660 may beperformed using a computer software code. Therefore for rail vehiclesthat may not initially have the ability to perform the steps disclosedherein, electronic media containing the computer software modules may beaccessed by a computer on the rail vehicle so that at least of thesoftware modules may be loaded onto the rail vehicle for implementation.Electronic media is not to be limiting since any of the computersoftware modules may also be loaded through an electronic media transfersystem, including a wireless and/or wired transfer system, such as butnot limited to using the Internet to accomplish the installation.

Locomotives produce emission rates based on notch levels. In reality, alower notch level does not necessarily result in a lower emission perunit output, such as for example gm/hp-hr, and the reverse is true aswell. Such emissions may include, but are not limited to particulates,exhaust, heat, etc. Similarly, noise levels from a locomotive also mayvary based on notch levels, in particularly noise frequency levels.Therefore, when emissions are mentioned herein, those skilled in the artwill readily recognize that exemplary embodiments of the invention arealso applicable for reducing noise levels produced by a diesel poweredsystem. Therefore even though both emissions and noise are disclosed atvarious times herein, the term emissions should also be read to alsoinclude noise.

When an operator calls for a specific horse power level, or notch level,the operator is expecting the locomotive to operate at a certaintraction power or tractive effort. In an exemplary embodiment, tominimize emission output, the locomotive is able to switch betweennotch/power/engine speed levels while maintaining the average tractionpower desired by the operator. For example, suppose that the operatorcalls for Notch 4 or 2000 HP. Then the locomotive may operate at Notch 3for a given period, such as a minute, and then move to Notch 5 for aperiod and then back to Notch 3 for a period such that the average powerproduced corresponds to Notch 4. The locomotive moves to Notch 5 becausethe emission output of the locomotive at this notch setting is alreadyknown to be less than when at Notch 4. During the total time that thelocomotive is moving between notch settings, the average is still Notch4, thus the tractive power desired by the operator is still realized.

The time for each notch is determined by various factors, such as butnot limited to, including the emissions at each notch, power levels ateach notch, and the operator sensitivity. Those skilled in the art willreadily recognize that embodiments of the invention are operable whenthe locomotive is being operated manually, and/or when operation isautomatically performed, such as but not limited to when controlled byan optimizer, and during low speed regulation.

In another exemplary embodiment multiple set points are used. These setpoints may be determined by considering a plurality of factors such as,but not limited to, notch setting, engine speed, power, engine controlsettings, etc. In another exemplary embodiment, when multiplelocomotives are used but may operate at different notch/power settings,the notch/power setting are determined as a function of performanceand/or time. When emissions are being reduced, other factors that may beconsidered wherein a tradeoff may be considered in reducing emissionsincludes, but are not limited to, fuel efficiency, noise, etc. Likewise,if the desire is to reduce noise, emissions and fuel efficiency may beconsidered. A similar analysis may be applied if fuel efficiency is whatis to be improved.

FIG. 21 depicts an embodiment of a speed versus time graph comparingcurrent operations to emissions optimized operation. The speed changecompared to desirable speed can be arbitrarily minimized. For example ifthe operator desires to move from one speed (S1) to another speed (S2)within a desired time, it can be achieved with minor deviations.

FIG. 22 depicts a modulation pattern that results in maintaining aconstant desired notch and/or horsepower. The amount of time at eachnotch depends on the number of locomotives and the weight of the trainand its characteristics. Essentially the inertia of the train is used tointegrate the tractive power/effort to obtain a desired speed. Forexample if the train is heavy the time between transitions of Notches 3to 5 and vice versa in the example can be large. In another example, ifthe number of locomotives for a given train is great, the time betweentransitions need to be smaller. More specifically, the time modulationand/or cycling will depend on train and/or locomotive characteristics.

As discussed previously, emission output may be based on an assumedNotch distribution but the operator/rail road is not required to havethat overall distribution. Therefore it is possible to enforce the Notchdistribution over a period of time, over many locomotives over a periodof time, and/or for a fleet locomotives over a period of time. By beingproviding emission data, the trip optimized described herein comparesthe notch/power setting desired with emission output based onnotch/power settings and determines the notch/power cycle to meet thespeed required while minimizing emission output. The optimization couldbe explicitly used to generate the plan, or the plan could be modifiedto enforce, reduce, and/or meet the emissions required.

FIG. 23 depicts an exemplary flowchart of steps for determining aconfiguration of a diesel powered system having at least onediesel-fueled power generating unit. One step disclosed in the flowchart700 provides for determining a minimum power, or power level, requiredfrom the diesel powered system in order to accomplish a specifiedmission, step 702. An emission output based on the minimum power, orpower level, required is determined, step 704. Another step provides forusing at least one other power level that results in a lower emissionoutput wherein the overall resulting power is proximate the powerrequired, step 706. Therefore in operation, the desired power level withat least another power level may be used and/or two power levels, notincluding the desired power level may be used. In the second example, asdisclosed if the desires power level is Notch 4, the two power levelsused may include Notch 3 and Notch 5.

As disclosed, emission output data based on notch speed is provided tothe trip optimizer. If a certain notch speed produces a high amount ofemission, the trip optimizer can function by cycling between notchsettings that produce lower amounts of emission output so that thelocomotive will avoid operating at the particular notch while stillmeeting the speed of the avoided notch setting. For example applying thesame example provided above, if Notch 4 is identified as a less thanoptimum setting to operate at because of emission output, but otherNotch 3 and 5 produce lower emission outputs, the trip optimizer maycycle between Notch 3 and 5 where that the average speed equates tospeed realized at Notch 4. Therefore, while providing speed associatedwith Notch 4, the total emission output is less than the emission outputexpected at Notch 4.

Therefore when operating in this configuration though speed constraintsimposed based on defining Notch limitations may not actually be adheredto, total emission output over a complete mission may be improved. Morespecifically, though a region may impose that rail vehicles are not toexceed Notch 5, the trip optimizer may determined that cycling betweenNotch 6 and 4 may be preferable to reach the Notch 5 speed limit butwhile also improving emission output because emission output for thecombination of Notch 6 and 4 are better than when operating at Notch 5since either Notch 4 or Notch 6 or both are better than Notch 5.

FIG. 24 illustrates a system for minimizing emission output, noiselevel, etc., from a diesel powered system having at least onediesel-fueled power generating unit while maintaining a specific speed.As disclosed above, the system 722 includes a processor 725 fordetermining a minimum power required from the diesel-powered system 18in order to accomplish a specified mission is provided. The processor725 may also determine when to alternate between two power levels. Adetermination device 727 is used to determine an emission output basedon the minimum power required. A power level controller 729 foralternating between power levels to achieve the minimum power requiredis also included. The power level controller 729 functions to produce alower emission output while the overall average resulting power isproximate the minimum power required.

FIG. 25 illustrates a system for minimizing such output as but notlimited to emission output and noise output from a diesel powered systemhaving at least one diesel-fueled power generating unit whilemaintaining a specific speed. The system includes processor 727 fordetermining a power level required from the diesel-powered system inorder to accomplish a specified mission is disclosed. An emissiondeterminator device 727 for determining an emission output based on thepower level required is further disclosed. An emission comparison device731 is also disclosed. The emission comparison device 731 comparesemission outputs for other power levels with the emission output basedon the power level required. The emission output of the diesel-fueledpower generating unit 18 is reduced based on the power level required byalternating between at least two other power levels which produce lessemission output than the power level required wherein alternatingbetween the at least two other power levels produces an average powerlevel proximate the power level required while producing a loweremission output than the emission output of the power level required. Asdisclosed herein, alternating may simply result in using at least oneother power level. Therefore though discussed as alternating, this termis not used to be limiting. Towards this end, a device 753 is providedfor alternating between the at least two power levels and/or at leastuse on other power level.

Though the above examples illustrated cycling between two notch levelsto meet a third notch level, those skilled in the art will readilyrecognize that more than two notch levels may be used when seeking tomeet a specific desired notch level. Therefore three or more notchlevels may be included in cycling to achieve a specific desired notlevel to improve emissions while still meeting speed requirements.Additionally, one of the notch levels that are alternated with mayinclude the desired notch level. Therefore, at a minimum, the desirednotch level and another notch level may be the two power levels that arealternated between.

While exemplary embodiment of the invention has been described withreference to an exemplary embodiment, it will be understood by thoseskilled in the art that various changes, omissions and/or additions maybe made and equivalents may be substituted for elements thereof withoutdeparting from the spirit and scope of the invention. In addition, manymodifications may be made to adapt a particular situation or material tothe teachings of the invention without departing from the scope thereof.Therefore, it is intended that the invention not be limited to theparticular embodiment disclosed as the best mode contemplated forcarrying out this invention, but that the invention will include allembodiments falling within the scope of the appended claims. Moreover,unless specifically stated any use of the terms first, second, etc. donot denote any order or importance, but rather the terms first, second,etc. are used to distinguish one element from another.

1. A method for minimizing emission output from a diesel powered systemhaving at least one diesel-fueled power generating unit, the methodcomprising: (a) determining at least one power level required from thediesel powered system in order to accomplish a specified mission; (b)determining an emission output based on the power level required; and(c) using at least one other power level that results in a loweremission output wherein the overall resulting power is proximate thepower required.
 2. The method according to claim 1, wherein the dieselpowered system comprises a railway transportation system, and whereinthe diesel-fueled power generating unit comprises at least onelocomotive powered by at least one diesel internal combustion engine. 3.The method according to claim 1, wherein the diesel powered systemcomprises a marine vessel, and wherein the diesel-fueled powergenerating unit comprises at least one diesel internal combustionengine.
 4. The method according to claim 1, wherein the diesel poweredsystem comprises an off-highway vehicle, and wherein the diesel-fueledpower generating unit comprises at least one diesel internal combustionengine.
 5. The method according to claim 1, wherein the diesel poweredsystem comprises a stationary power generating station, and wherein thediesel-fueled power generating unit comprises at least one dieselinternal combustion engine.
 6. The method according to claim 1, whereinthe diesel powered system comprises a network of stationary powergenerating stations, and wherein the diesel-fueled power generating unitcomprises at least one diesel internal combustion engine.
 7. The methodaccording to claim 1, wherein the at least one other power level isbased on at least one of a notch level, traction power, and engine speedlevel.
 8. The method according to claim 1, wherein the step of usingfurther comprises determining a rate of using based on at least one ofemission output from operating in the at one other power level, engineoperating characteristics, and operator sensitivity.
 9. The methodaccording to claim 1, wherein the at least one other power level isdetermined based on at least one of engine speed, an engine controlsetting, and power setting, engine performance, and mission operatingtime.
 10. The method according to claim 1, wherein the step of usingfurther comprises determining at least one other power level based on atleast one of engine power information, power level information, vehicleinformation to determine the at least one other power level.
 11. Themethod according to claim 1, wherein the step of using further comprisesautomatically controlling operation of the diesel powered system byautomatically using the at least one other power level based on at leastone of engine power information, power level information, and vehicleinformation.
 12. The method according to claim 1, wherein the step ofusing further comprises determining the at least one other power levelbased on at least one of engine power information, power levelinformation, and vehicle information for manual implementing.
 13. Acomputer software code for minimizing emission output from a dieselpowered system having a computer and at least one diesel-fueled powergenerating unit, the computer software code comprising: (a) a computersoftware module for determining at least one power level required fromthe diesel powered system in order to accomplish a specified mission;(b) a computer software module for determining an emission output basedon the at least one power level required; and (c) a computer softwaremodule for using at least one other power level that results in a loweremission output wherein the overall resulting power is proximate thepower required.
 14. The computer software code according to claim 13,wherein the computer software module for using further comprises acomputer software module for determining a rate of using based on atleast one of emission output from when operating in the at one otherpower level, engine operating characteristics, and operator sensitivity.15. The computer software code according to claim 13, further comprisesa computer software module for determining the at least one other powerlevel based on at least one of engine speed, an engine control setting,and power setting, engine performance, and mission operating time. 16.The computer software code according to claim 13, wherein the computersoftware module for using further comprises a computer software modulefor evaluating at least one of engine power information, power levelinformation, vehicle information to determine the at least one otherpower level to determining at least one of a using rate and the at leastone other power level.
 18. A system for minimizing emission output froma diesel powered system having at least one diesel-fueled powergenerating unit, the system comprising: (a) a device configured todetermine an emission output based on a power level required; (b) apower level controller configured to use at least one other power levelso that the resulting power level is nearly equivalent to the powerlevel required while emission output from the at least one other powerlevel is less than the emission output from the desired power level; and(c) a processor configured to at least one of determine the minimumpower level required from the diesel powered system in order toaccomplish a specified mission and determine when to use the at leastone other power level.
 18. The system according to claim 17, wherein theprocessor determines a trade-off between emission output and vehiclepower settings to maximize higher operation settings where the emissionsfrom the exhaust after-treatment devices are optimized.
 19. The systemaccording to claim 17, wherein the diesel powered system comprises arailway transportation system, and wherein the diesel-fueled powergenerating unit comprises at least one locomotive powered by at leastone diesel internal combustion engine.
 20. The system according to claim17, wherein the diesel powered system comprises a marine vessel, andwherein the diesel-fueled power generating unit comprises at least onediesel internal combustion engine.
 21. The system according to claim 17,wherein the diesel powered system comprises an off-highway vehicle, andwherein the diesel-powered generating unit comprises at least one dieselinternal combustion engine.
 22. The system according to claim 17,wherein the diesel powered system comprises a stationary powergenerating station, and wherein the diesel-fueled power generating unitcomprises at least one diesel internal combustion engine.
 23. The systemaccording to claim 17, wherein the diesel powered system comprises anetwork of stationary power generating stations, and wherein thediesel-fueled power generating unit comprises at least one dieselinternal combustion engine.
 24. The system according to claim 17,further comprises an optimizer connected to the processor.
 25. Thesystem according to claim 24, wherein the optimizer is configured toevaluate at least one of engine power information, power levelinformation, vehicle information to determine the at least two powerlevels.
 26. A system for minimizing emission output from a dieselpowered system having at least one diesel-fueled power generating unit,the system comprising: (a) a processor configured to determine a powerlevel required from the diesel powered system in order to accomplish aspecified mission; (b) a first device configured to determine anemission output based on the power level required; (c) an emissioncomparison device configured to compare emission outputs for other powerlevels with the emission output based on the power level required; and(d) a second device configured to use at least one other power level sothat a resulting power level is proximate the required power level sothat an emission level resulting when using the at least one other powerlevel is less than the power level required.
 27. The system according toclaim 26, wherein the processor determines a trade-off between emissionoutput and vehicle power settings to maximize higher operation settingswhere the emissions from the exhaust after-treatment devices areoptimized.
 28. The system according to claim 26, wherein the dieselpowered system comprises a railway transportation system, and whereinthe diesel-fueled power generating unit comprises at least onelocomotive powered by at least one diesel internal combustion engine.29. The system according to claim 26, wherein the diesel powered systemcomprises a marine vessel, and wherein the diesel-fueled powergenerating unit comprises at least one diesel internal combustionengine.
 30. The system according to claim 26, wherein the diesel poweredsystem comprises an off-highway vehicle, and wherein the diesel-poweredgenerating unit comprises at least one diesel internal combustionengine.
 31. The system according to claim 26, wherein the diesel poweredsystem comprises a stationary power generating station, and wherein thediesel-fueled power generating unit comprises at least one dieselinternal combustion engine.
 32. The system according to claim 26,wherein the diesel powered system comprises a network of stationarypower generating stations, and wherein the diesel-fueled powergenerating unit comprises at least one diesel internal combustionengine.
 33. The system according to claim 26, further comprises anoptimizer connected to the processor.
 34. The system according to claim33, wherein the optimizer is configured to evaluate at least one ofengine power information, power level information, vehicle informationto determine the at least two power levels.
 35. In a fleet of dieselpowered systems where each diesel powered system of the fleet has atleast one diesel-fueled power generating unit, a method for minimizingoverall emission output from at least one of the fleet and an individualdiesel powered system, the method comprising: (a) determining overallfleet emission output level; (b) determining a desired overall fleetemission output level; (c) comparing the overall fleet emission outputto the desired overall fleet emission output level; (d) if the desiredoverall fleet emission output level exceeds the overall fleet emissionoutput level, determining at least one other power level that results ina lower emission output to use with an required operating power levelthat has a higher emission output for each respective diesel poweredsystem within the fleet; (e) using the at least one other power levelfor each respective diesel powered system to meet the desired overallfleet emission output level wherein the overall resulting power levelfor each respective diesel powered system is proximate the power levelrequired.
 36. The method according to claim 35 wherein the step ofdetermining and the step of using continue until the overall emissionoutput is within a range of the desired overall emission output level.37. A method for minimizing emission output from a diesel powered systemhaving at least one diesel-fueled power generating unit that may haveexceeded an emission level during a first part of a specific period, themethod comprising: (a) determining overall emission output level for thespecific period; (b) determining a desired overall emission output levelfor the specific period; (c) comparing the overall emission output tothe desired overall emission output level; (d) if the overall emissionoutput level exceeds the desired overall emission output level,determining at least one other power level that results in a loweremission output to use with a required operating power level that has ahigher emission output; and (e) using the at least one other power levelto meet the desired overall emission output level wherein the overallresulting power level is proximate the power level required.
 38. Themethod according to claim 37 wherein the step of determining and thestep of using continue until the overall emission output is within the arange of the desired overall emission output level.
 39. The methodaccording to claim 37 wherein period comprises at least one of a timeperiod and a specific mission.